Micro SD UltraII - 8525, TyTN, MDA Vario II, JasJam Accessories

I need to buy a new MicroSD card, so I'm shopping around a bit. Tell me, is the ULTRA II from SanDisk really that much faster than a standard microSD?
They cost quite a bit more

this has already been discussed, do a search dude.

Sorry, you're right it has been discussed. But a satisfactory answer has not been reached. Some people speculate that it makes no difference because of the read speed of the device. Others say it should be twice as fast.
The one person who has actually tested it with both cards was using a wizard, apparently the mp3's & vid files load faster. What I want to know is whether an actual increase program speed will be noticed, like with navigator maps etc.

Related

[Heads Up] 32Gig Class 4 Sandisk Micro SD $20

Pretty good deal, 32Gig class 4 sandisk for only $20
http://mobile.dailysteals.com/
That's a great deal! But don't we want a faster class (like 10)?
This is a matter of debate that can be argued from many angles, most commonly Cache Vs Class. There has been lots of debating on XDA and other forums about how android functions and little to no advantage is seen. I'd really prefer this didn't turn into a debate yet again as there is plenty of places that this be read up on. I run this exact card in 3 nook colors and 4 Android phones currently in my house. never had any hickup in video playback yet.
Chief Geek said:
This is a matter of debate that can be argued from many angles, most commonly Cache Vs Class. There has been lots of debating on XDA and other forums about how android functions and little to no advantage is seen. I'd really prefer this didn't turn into a debate yet again as there is plenty of places that this be read up on. I run this exact card in 3 nook colors and 4 Android phones currently in my house. never had any hickup in video playback yet.
Click to expand...
Click to collapse
know the exact threads where these debates are?
Chief Geek said:
This is a matter of debate that can be argued from many angles, most commonly Cache Vs Class. There has been lots of debating on XDA and other forums about how android functions and little to no advantage is seen. I'd really prefer this didn't turn into a debate yet again as there is plenty of places that this be read up on. I run this exact card in 3 nook colors and 4 Android phones currently in my house. never had any hickup in video playback yet.
Click to expand...
Click to collapse
I wasn't gonna get into the tit for tat about speed.
But I have a legit question, how's about recording 720p? Seeing the Note is capable of it.
I usually have Class 2, that have worked very well in most of my phone/tablet devices. I rarely if ever record any video that would require any type of "high" resolution, yet.
As for playback, I've not had any issue with even the Class 2 SanDisk... YMMV with other "brands" and/or counterfeits..
kaishi00 said:
know the exact threads where these debates are?
Click to expand...
Click to collapse
Basic write up about the usage. Article boils down if you depend heavily on apps2SD then you may want to go to class6
http://lifehacker.com/5804661/does-it-matter-what-class-micro-sd-card-i-have-in-my-android-phone
Here's a great write up on the Cache aspect.
http://www.xda-developers.com/android/increase-the-reading-speed-of-your-sd-card/
And for the true nitty gritty numbers, and instructions on how to test your own card, check out:
http://forum.xda-developers.com/showthread.php?p=15269669#post15269669
If you want to do a full on discussion then by all means please post it in the QA section, I'm not avoiding the topic, I'm avoiding a derail.
Budge said:
That's a great deal! But don't we want a faster class (like 10)?
Click to expand...
Click to collapse
I bought his same exact card about 6 months ago for $35. DISREGARD the "class 4" rumors and whatnot. My music and videos play at such an amazing rate you'd assume the card is an expensive high class etc etc. The only notable difference is when your copying your music/videos to the card from your computer. So what..wait acouple of hours for 4000 songs to get copied! I did and for the price how could you say no?
I seriously think Sandisc is really the best company to trust with micro SD cards
|Captivate|Galaxy Note LTE|Darth Maul, and music| http://www.last.fm/user/Ray_Banci?noredirect=1 |
Ray_Banci said:
I
I seriously think Sandisc is really the best company to trust with micro SD cards
|Captivate|Galaxy Note LTE|Darth Maul, and music| http://www.last.fm/user/Ray_Banci?noredirect=1 |
Click to expand...
Click to collapse
absolutely, for me they have far and away been the most consistantly fast cards. You just have to be careful, there are lots of fakes and knockoffs out there that look identical, especially on ebay. Beware anything anyone selling them without OEM packaging. I have fallen for the "these were returns, so we're selling them cheaper since they are out of package" If it's not in Sandisk authenticate packaging, I won't touch it. The 32Gb I bought at walmart a few months ago cost me $50, and that was a decent deal then.
Sorry. I didn't mean to derail the topic. I use the camera a lot for 1080P video, which uses large files and needs a fast write speed. For me, the class 6 or 10 might be better. But after reading the threads you linked to, it does seem that the Sandisk class 4 would be the best all-rounder for most people. Thanks again for the thread. I may order one and give it try anyway. I'll let you know.
Budge said:
Sorry. I didn't mean to derail the topic. I use the camera a lot for 1080P video, which uses large files and needs a fast write speed. For me, the class 6 or 10 might be better. But after reading the threads you linked to, it does seem that the Sandisk class 4 would be the best all-rounder for most people. Thanks again for the thread. I may order one and give it try anyway. I'll let you know.
Click to expand...
Click to collapse
I believe when recording it saves locally then once stopped it goes to perm storage, this used to be the way it was, may or may not have changed but would make sense to keep this this way.
I keep a card or two on hand loaded with movies and TV shows for when I travel or know I'll be sitting bored for awhile just incase the 32 I have installed doesn't have enough entertainment. For $20, you can't lose.
By save locally, you mean save/cache/buffer on phone then to external storage if so configured?
I doubt it would do that, as the phone's internal memory is write limited by the same limits as an SD card, correct?
#SGH-I717 (Note™ ) via Tapatalk
Chief Geek said:
I believe when recording it saves locally then once stopped it goes to perm storage, this used to be the way it was, may or may not have changed but would make sense to keep this this way.
I keep a card or two on hand loaded with movies and TV shows for when I travel or know I'll be sitting bored for awhile just incase the 32 I have installed doesn't have enough entertainment. For $20, you can't lose.
Click to expand...
Click to collapse
Def a good deal. Compare to $80 64 Class 6 card i just bought.
I like to post a good deal and LIKE to see how ppl react. Some appropriated because they just got a good deal, some will be *****y this and that because they are not free??, ... . People will never be satisfied.
Suggest to others: if you don't like it just because of ANY REASONS, swallow it then move on to the next thread. It may not be useful for you but will be useful for some others.
clockcycle said:
By save locally, you mean save/cache/buffer on phone then to external storage if so configured?
I doubt it would do that, as the phone's internal memory is write limited by the same limits as an SD card, correct?
#SGH-I717 (Note™ ) via Tapatalk
Click to expand...
Click to collapse
I'm not real sure to be honest man, it's mostly theory because in the past on slower android phones, after I finished recording it would take a few seconds as it "saved" anything more then a few moments of video. I contributed this to holding locally then transferring to external afterwards. In my head, doing it this way would eliminate any pauses in recording caused by what I would imagine would be slower read/write speeds as the primary partition access is faster then the external SD. We would need a dev/programmer with knowledge of these things to confirm/bust this theory. But anyways, back on track, great deal for a big card.
other sites I check daily for these deals is Woot.com and Tanga.com
Tanga is especially known for funny tshirts for dirt cheap. They both have a few deals per day. Sometimes amazing sometimes less than.
Chief Geek said:
I'm not real sure to be honest man, it's mostly theory because in the past on slower android phones, after I finished recording it would take a few seconds as it "saved" anything more then a few moments of video. I contributed this to holding locally then transferring to external afterwards. In my head, doing it this way would eliminate any pauses in recording caused by what I would imagine would be slower read/write speeds as the primary partition access is faster then the external SD. We would need a dev/programmer with knowledge of these things to confirm/bust this theory. But anyways, back on track, great deal for a big card.
other sites I check daily for these deals is Woot.com and Tanga.com
Tanga is especially known for funny tshirts for dirt cheap. They both have a few deals per day. Sometimes amazing sometimes less than.
Click to expand...
Click to collapse
It's a sound theory to me, though I don't 100% agree it does make a lot of sense. Personally I'd chalk it up to having an older phone, I do know what you're talking about my G1 did the exact same thing.
As for speed differences between different classes of SD cards, though it is hotly debated, I've personally did a little seat of the pants bench marking between my class 2, 4, 6 and 10 and in the end my class 10 was only 2 or 3 seconds faster on multiple smaller file transfers, when it came to one large file (such as what you'd expect from a 720p video) the difference was negligible.
As for the main post, it's one heck of a deal. if i hadn't already bought a class 10 i'd jump on this. Heck, I own a tablet, I might still order one.
Also if you want to check out daily deals, check out dodtracker.com. it's a collection of deal sites. its not very pretty, but it does get the job done.
Theoriginalgiga said:
It's a sound theory to me, though I don't 100% agree it does make a lot of sense. Personally I'd chalk it up to having an older phone, I do know what you're talking about my G1 did the exact same thing.
As for speed differences between different classes of SD cards, though it is hotly debated, I've personally did a little seat of the pants bench marking between my class 2, 4, 6 and 10 and in the end my class 10 was only 2 or 3 seconds faster on multiple smaller file transfers, when it came to one large file (such as what you'd expect from a 720p video) the difference was negligible.
As for the main post, it's one heck of a deal. if i hadn't already bought a class 10 i'd jump on this. Heck, I own a tablet, I might still order one.
Also if you want to check out daily deals, check out dodtracker.com. it's a collection of deal sites. its not very pretty, but it does get the job done.
Click to expand...
Click to collapse
Wow, you wern't joking that is ugly. Once I figure out how to navagate it I'm sure it'll be useful. As for my theory, ohwell, it's just a shot in the dark. If anyone's thinking about this card, act now before it's too late, there will be a new deal tomorrow.
Missed it by 2 minutes while reading the thread... SMH
Sent from my SAMSUNG-SGH-I717
I was on the fence about ordering this one, and then I read another post on how to store a second flash card underneath the back cover.
http://forum.xda-developers.com/showthread.php?t=1550541
So I decided to go for it. I'll use it for everyday stuff. If it works well for HD video recording and playback, then I'm all good. If not, I'll just keep a second card for backup. Thanks again, Chief.
Budge said:
I was on the fence about ordering this one, and then I read another post on how to store a second flash card underneath the back cover.
http://forum.xda-developers.com/showthread.php?t=1550541
So I decided to go for it. I'll use it for everyday stuff. If it works well for HD video recording and playback, then I'm all good. If not, I'll just keep a second card for backup. Thanks again, Chief.
Click to expand...
Click to collapse
Glad I could help. Todays deal is a set of decent looking BlueTooth headphone for $15, perfect for anyone looking for a cheap set of gym headphones. After having a nice pair stolen I buy cheapies for the gym now. Usually RocketFish, but may get a pair of these to keep on hand just incase.

Why are people upset over the sd card?

Look folks I own the latest HTC phone built with an sd card. The evo lte. Having an sd card really isnt that big of a deal. The onboard sd card is much faster and i have a class 10 sandisk 32. Nothing is faster than that but onboard storage. Basically i use root explorer alot and any files not being used or accessed at that time you keep on the card anything current or needed to be flashed you keep onboard. Its almost like you have 2 sd cards not one. Now obviously the dna will not have this but a simple flash drive and adapter is the exact same thing! The only difference would be you cant run the files off the flash drive without transfering them but im not sure why you would run them off an external anyway if you had them? Onboard memory is faster anyhow? I just dont see why the fuss? Yall are mad about nothing lol. Flash drives cost about 20% more than a sd card. Relax its not a big deal. Lol
sent from my Evo 4g LTE
16GB isn't future proof for apps (mostly games). I wouldn't want to plug in a flash drive to play some games - that would be incredibly annoying. Other than that, I don't see it as a big deal. I also never listen to music while out though (besides car radio). I currently only use 3GB of space on my Incredible, but it also just can't handle any real games lol.
They have games bigger than 16 gb lol? I dont play games really but ok.
sent from my Evo 4g LTE
thetunicakid said:
They have games bigger than 16 gb lol? I dont play games really but ok.
sent from my Evo 4g LTE
Click to expand...
Click to collapse
Some are over 2GB already, HD ones that inevitably come out soon will be 3-4GB. Well, the free roaming ones anyway - Angry Birds never will be. That means if only storing apps you could only have 3-4 games before running out of space. It's only 11GB free after formatting and the Jellybean/Sense etc.
I dont game on phones and never will. just got a 32gb nexus 7 so when my nephews come over they can play all the .99 cents games I bought last year. Stay away from my phone lol. I game but true joy is on big screen, xbox, pc, ps3, I really could care less about gaming on 5inch or 7inch screen where I get tired of controls after 5 mins.
Man im on my phone enough as it is! The last thing I need is another addiction lol.
sent from my Evo 4g LTE
It's a big deal for me as I have >35GB of music on my 64GB card currently. I had been looking forward to looking at this phone but not any more.
Guess it's the limitation
With the LTE clocking in around 20-50 Mbps where I live, I'm carrying about 20 million songs with me everywhere I go
impala454 said:
With the LTE clocking in around 20-50 Mbps where I live, I'm carrying about 20 million songs with me everywhere I go
Click to expand...
Click to collapse
Until Verizon inevitably takes away unlimited data. Then if you listen a lot...
People always bring up that they have like 50GB of music.
I have a ton of music too, but come on people. Do you need to carry every single song you own with you in your pocket? REALLY?
I pick a few hundred songs to put on my phone and when I get tired of it I put new ones on.
thetunicakid said:
Look folks I own the latest HTC phone built with an sd card. The evo lte. Having an sd card really isnt that big of a deal. The onboard sd card is much faster and i have a class 10 sandisk 32. Nothing is faster than that but onboard storage. Basically i use root explorer alot and any files not being used or accessed at that time you keep on the card anything current or needed to be flashed you keep onboard. Its almost like you have 2 sd cards not one. Now obviously the dna will not have this but a simple flash drive and adapter is the exact same thing! The only difference would be you cant run the files off the flash drive without transfering them but im not sure why you would run them off an external anyway if you had them? Onboard memory is faster anyhow? I just dont see why the fuss? Yall are mad about nothing lol. Flash drives cost about 20% more than a sd card. Relax its not a big deal. Lol
sent from my Evo 4g LTE
Click to expand...
Click to collapse
I'm sure that not only 16GBs (11GBs usable), 8GBs (yep, 3GB usable only) storage is enough for many people who only surf webs, facebook, sometimes take some photos, listen to music a little bit and have some small apps. I think at least 50-70% smartphone owners use their device this way.
However, there are still a lot of people needing bigger storage for many purposes, and I dont know what you wanna ask. For you it's enough, and for others it's not, that is personal opinion and purpose.
Something similar that I saw in other fanboys' topics, such as when people blamed on iPhone about it's storage, close OS, small screen or just no bluetooth sharing, and many shew a ton of evidences that it's enough. The same thing with Samsung's plastic and Motorola's bootloader.
I personally don't use my phone for games, music or movies. I use it for email, calls, texts and web-browsing (as well as for certain productivity apps). However, I can certainly see how someone looking to use their phone as an all-in-one multimedia device would not be satisfied with 16gb.
In the end, like everything else in the world, it really is just subjective and based on personal use requirements which is why there is no reason for people to bash a device for so-and-so reason or for people to bash the people doing so because, at the end of the day, there's always a group out there that will find the specs of any piece of technology adequate for their needs.
flaring afro said:
Until Verizon inevitably takes away unlimited data. Then if you listen a lot...
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Click to collapse
There's no way I'll ever come close to the limit listening to streaming music. To take up 4GB of data I'd have to listen to 128 Kbps streaming constantly for 69 hours. Some people might have issue with that but I know I won't. Plus I tend to use the spotify feature to download my favorite playlists to the device so it's rarely streaming anyways. Automatic sync and everything. It's a wonderful setup for music for only $10/mo.
thank you
impala454 said:
There's no way I'll ever come close to the limit listening to streaming music. To take up 4GB of data I'd have to listen to 128 Kbps streaming constantly for 69 hours.
Click to expand...
Click to collapse
Aren't the data plans 2gb/$30 and 5gb/$50 a month? There is a big difference between streaming up to 2gb vs. 4gb.
Simple. They need access to more than 13gb of stuff. Is it really beyond your comprehension that there are people in the world that need this? I think using a flash drive with my phone is really cool but its a bit ridiculous to think it could replace the function of an SD card. You may as well ask why anyone would want more that 8gb of data on a phone or 4gb of data.
Or better yet why do you think you need more than 1gb of storage on your phone. I only use my phone for email and the internet so I can't understand why anyone in the world would need more than a gigabyte, I mean my email cache is like less than 100mb and the internet is LITERALLY on the internet so I don't need ANY storage for that. Even if i downloaded an app, that's like what, a few more mbs? What could anyone possible have on their phone that would exceed 1gb.
Your experience ≠ everyone else.
Thrillhouse847 said:
Aren't the data plans 2gb/$30 and 5gb/$50 a month? There is a big difference between streaming up to 2gb vs. 4gb.
Click to expand...
Click to collapse
Not really to me. I track my usage and over the past six months on my Sprint EVO 4G I've averaged ~415MB per month total. That includes my spotify usage, internet, maps, searches, occasional youtube, etc. Of course I see my usage going up somewhat when I get on LTE, but not by tenfold. My original point was that the need to carry around 50GB of music is nullified (at least for me) by using something like Spotify.
My remaining question to those who insist on carrying that much music, why are you only limiting yourself to that much? I mean, I have 200GB+ on a storage drive at home. You can't carry all that around so what's the difference between 50 and 200?
I could care less about not having an SD card, but I don't play games or store music so much less memory is needed for my use. I can completely understand those who game a lot and store music and vids needing one. My biggest concern would be getting it rooted and being able to access the hotspot hacked of course. When this can be done ill be very tempted to pick one up.
AliceBToklas said:
It's a big deal for me as I have >35GB of music on my 64GB card currently. I had been looking forward to looking at this phone but not any more.
Click to expand...
Click to collapse
I was worried about the lack of storage expansion in my current device, but I soon realized I didn't need my entire music collection with me all the time.
I have a lot of music, but I just don't listen to it often enough for an SD card slot (or lack thereof) to be a deal breaker
Sent from my Galaxy Nexus using xda premium

[Q] Which microSD card?

Hi all..
This is a fairly beginnerish question, I know, but i've just ordered an Xperia Z2 tablet and i'm now trying to buy a microSD card for it, but the range of possible cards with different letters and sizes and descriptions is crazy.
Can someone tell me which ones I am limited to (and perhaps which ones are better to get)? If it makes any difference, I would use it to store video files, so the bigger the capacity the better.
I think it says on the Sony website that it can do 'up to' 128gb, which seems like heaps. Just hoping for clarification on this. Some Googling and reading around has got me nowhere.
Thanks!
Any MicroSD card will do.
Two main considerations are capacity and speed. Capacity is the easy one, most cards will offer a 64GB size. Sandisk is the only company with a readily available 128GB card out today.
Speed is the other factor. Although I don't have a Z2 tablet, if it shares the same memory controller as the Z2 phone, it is a very good one and can take advantage of the fastest MicroSD cards out today. Slower cards can hinder performance when taking pics, video, etc.
This is a recent thread on the Z2 forums: http://forum.xda-developers.com/showthread.php?t=2764546
As mentioned in that thread, my personal favorite is the Samsung Pro 64GB, excellent performance.

[Q] what are the SD card requirements for 2014 tab pro 10.1

Hi all,
I have the 10.1 2014 tab pro and I want to get a new SD card. I know from my brief reading through these forums that not all SD cards will work and I dont know enough to really understand what is what (like what does "SDHC Tf Class 10" mean?). If anyone knows what it is that I need to look for before buying one so that it will work fine with my tablet please post here.
ps I am using these primarily to store books and documents, not videos or games or anything that really takes a massive workload or speed requirement.
pps Im not sure if this matters, but I am running stock unrooted
TIA
Most any newly purchased MicroSD card should do. What did you read won't work? Below Class 10 cards might not work for some high speed functions (like video), but I believe all should work for casual use like you describe.
SDHC versus SDXC mainly refers to the capacity of the card, which you are probably going to be looking at separately (in GB) anyway, so it really doesn't matter. Basically, the original SD standard (also called SDSC) was limited to 2 (4?) GB. SDHC increased the capacity up to 32 GB, and anything higher than that is SDXC by definition. There are some other minor differences, but probably nothing you really need to worry much about.
Class (8, 10, etc.) refers to the read/write speed; but you may also see a UHS speed classification (U1, U3) also. Even though you are not talking about high speed demand tasks, I'd still tend toward Class 10 or U1 cards. Just in case you change your mind about what you want to save to the card; and many cards meet Class 10 or U1, anyway. For the few cards that you can find with lower speed class, you might save $10, so its probably not even worth it to consider lower speed class cards.
The following Wiki articles goes into a lot more detail about the specs: http://en.wikipedia.org/wiki/Secure_Digital
Out of all this, I'd be more worried about brand, or getting a counterfeit product. Some cheap or off-brand cards seem to fail more frequently than the big names. Folks all have their favorites, and may argue that you are just paying more for the brand. But I've bought several Sandisk cards, and never had any issues (and heard similar from other users on XDA).
I'd also stick to a reputable seller (Newegg, Amazon, etc.) as places like eBay are awash with counterfeit SD cards. Its so easy to relabel a card as a higher capacity (i. e. take a 32 GB card and label it as 128 GB, etc.) and even spoof the device to read it as the "fake" capacity, than charge much more $$$.
I am using one of these on my TabPRO:
http://www.amazon.co.uk/Samsung-MicroSDHC-Memory-without-adapter/dp/B00AYC6V2U
Works fine on all my Android devices.
And to really leverage it outside of Google Apps and pre-installed items you need to root and enable write to the SD card, unfortunately. (Unless I'm missing something.)
Thanks, I really appreciate that info on what all those terms mean. However, right now I am using a 32gb Sandisk ultra, and my data keeps getting corrupted, apps cant find it, showing up empty on every file explorer I try.... Therefore I thought since Sandisk is legit (I bought it at costco so its real Sandisk) I figured there must be some issue with the type of card.
pie_are_squared said:
Thanks, I really appreciate that info on what all those terms mean. However, right now I am using a 32gb Sandisk ultra, and my data keeps getting corrupted, apps cant find it, showing up empty on every file explorer I try.... Therefore I thought since Sandisk is legit (I bought it at costco so its real Sandisk) I figured there must be some issue with the type of card.
Click to expand...
Click to collapse
I had similar issues with a genuine SanDisk card in my S3 (couldn't access it in recovery either), just showed a bunch random characters instead of file names etc), swapped it to a different brand (I got a genuine Sammy one because it was a bargain at the time) and that solved the problem....

Are advanced MicroSD cards any good for smartphones?

So I am switching from iPhone to S8 and I am looking for SD cards to buy. The last one I bought was Class 10 (U1) like 8 years ago. It appears there are some new standards which go upto UHS-III and boast solid speeds (U3). However, it also looks like they are aimed at video recording (GoPro/dones) use.
Do any of these advanced cards (U3) offer significant speed improvement in a smartphone like Galaxy S8 or should I just stick to U1?
What do you plan on putting on the sdcard? With my samsung evo+ card 80read/20write the gallery thumbnail loading speeds are dog slow. If you're just going to put miscellaneous stuff any card will do, 64gb of storage should be enough.
Damn thats slow... I do plan to use it for occasionally transferring movies, etc. but I am just not a fan of lags/slow loading like in your case which is why I was considering the advanced one. But if that's the general case then I guess an upgrade might be worth it :/
Thumbnail loading isnt really a factor of the memory card.. My Note 5 some gallery thumbnails NEVER load, and most others take a while, and thats all from internal storage. EVO+ cards in phones are generally great and shouldnt give any noticeable lag on top of any lag the phone/app itself shows. The biggest thing youll notice between cards is, obviously, transfer rates. If you will be copying data to/from the phone from/to another device, a good quality high-speed card makes a world of difference. anything with a real 80MB/s read speed will be fine, just make sure you arent getting a clone, so doublecheck who the seller is if ordering from Amazon, and to be safe DO NOT order from eBay.
Yashraj said:
Damn thats slow... I do plan to use it for occasionally transferring movies, etc. but I am just not a fan of lags/slow loading like in your case which is why I was considering the advanced one. But if that's the general case then I guess an upgrade might be worth it :/
Click to expand...
Click to collapse
For movies you should be fine, for me its loading a 1000 thumbnails that's the slow part, once they're loaded everything is fine. But from time to time it has to reload the thumbnails and its somewhat annoying.
There is an article somwhere floating around from last week on what cards to use etc.
If you use for photos and 4k vid etc the faster the better basically.
I think the more relevant question/answer here is whether the phones will support UHS-II and UHS-III. A few people have been asking that and I have not yet seen an answer. Since II and III have an extra set of pins, I would imagine it requires the host device to specifically support it by being able to use those extra pins. *If* they are backwards compatible (I don't know), then the cards might work anyway but would work at slow speed if the device doesn't support II or III and be a waste of money (obviously if not backwards compatible then it wouldnt work at all).
I still haven't seen an answer yet and as always samsung's specs dont tell you anything. We probably need someone with one of the faster cards and an S8 to try it out with A1 benchmark and see what speeds they get.
I don't think it supports UHS II or 3. I read somewhere that it supports UFS, which is Samsung's own higher speed format, which I don't think is as backwards compatible.
UHS I cards also have their own speed classes, U1 and U3 currently I think. U3 just guarantees higher sustained write speed (30MBps,) which is well within the UHS I maximum transfer speed.
If you're confused, the UHS class is the interface speed. The U1 or U3 are the minimum speed of the specific card. UHS I max speed is a little over 100MBps iirc.

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