I want to buy a sd card but i m not sure which one is better
Lexar SD 256MB 32X Speed (about 70$) or
SanDisk 512MB SD (about 106$)
512 mb looks great choice but the other is high speed ???????????
i need your comments
sandisk is not know for it's speed as it is
but very fast SD cards will never reach their top speed
in the xda their sd interface is not fast enough
if you search the forum you'll find some guy who did some tests
think the sd card did 10MB /sec in the sdcard reader on the pc
and only about 1.3 MB /sec in the xda
not all that impressive
And for the XDAII? Waht is the speed of the port?
well i forget if it were tests made on the xda1 or 2
but arm 200 which the xda 1 have dont have a nativ interface
for sd so it use an external chip and the xcale 400 that the
xda2 have have a native interface
too bad that nativ interface is WAY slower then the external chips
pda's used to use
there were some posts before xmas about places where the xda it would be way faster then the xda2
but that was in the old forum not sure if those posts are lost now
here is a line from a writing about xscale's performance on ipaq
which i asume would be the same for xda2 unless they added a mem controller and dident use the internal xscale one
Because the XScale CPU itself contains an MMC controller that supports SD and SDIO, and that's almost certainly what HP is using, rather than adding a chip of their own. MMC and SD are very similar, almost identical. The difference is that MMC uses a 1-bit data bus, and SD uses a 4-bit bus. See, we're back to buses again. Since the XScale's controller is MMC-based, the new iPAQs will have 1-bit bus transfer rates. Hang on to your CF sleeves for big data.
Click to expand...
Click to collapse
from
http://www.writingonyourpalm.net/column020624.htm
ogn said:
I want to buy a sd card but i m not sure which one is better
Lexar SD 256MB 32X Speed (about 70$) or
SanDisk 512MB SD (about 106$)
512 mb looks great choice but the other is high speed ???????????
i need your comments
Click to expand...
Click to collapse
I got a Billington 512MB SD card 40x speed. It is OK. Cost about SGD$245.
Related
What is the maximum capacity of SD cards that XDA supports?
Can I put 128MB SD card in XDA?
If you have used the search button or looked on other postings you'll have seen that the maximum capacity used in the XDA is in the moment at 512MB
(I don't now, if any bigger is available...)
So you can use your "small"SD card with 128 megs without problems....
Regards
Stefan
Hi all,
I need your opinion. I'm planning to buy a Sandisk 512MB SD Card. How much does it compare with the 256SD Card with regards to speed? Is reading/writing much slower because of its bigger size? BTW my device is XDA. Thanks
My understanding of speed diffs
I don't think 256 vs 512 will make speed differences. The speed differences come between specific cards. My brief research yesterday suggested to me that SanDisk are kinda slow, even the Ultra II cards. It seems the fastest card, consistently, is the Panasonic. I have a plain 256MB sandisk card it PocketMechanic benchmarks it at 0.7x. I will test my new Panasonic card when it arrives later today (hopefully!).
Just for comparison, Lexar 32x cards are rated at 4.8MB/s, the Panasonic is supposedly rated at 10MB/s.
Another data point, I saw a discussion on Amazon.com reviews about the SanDisk 512 and somebody stating it was faster than the 256.
All this leads to: you really need to benchmark the specific cards you are interested in to see if they meet your speed needs. Speed is really variable, people talking about a single process that takes 45 minutes on one card and just like 1 minute on another card (brand).
Got the panasonic card
I got the panasonic card. It writes at "2.9x" as opposed to "0.7x" I got with the stock sandisk. That is better than 4 times the speed. Benchmarked using Pocket Mechanic on an XDA.
Hi,
Can anyone having micro SD 2GB ultra card can tell us about its performance? I have heard that 2Gb card as such had some impact on the performance of the phone and slows it a bit down? Is there any improvement using this faster card?
I have SanDisk 2GB MicroSD - in my opinion it's quicker than my previous 1GB.
I have seen sandisk 2gb ultra II micro sd card in the market. I just wanted to know if it improves the performance over the simple 2gb micro sd card?
i have a SanDisk 2GB standard MicroSD and performance is great, no slow downs on anything.
its a lot faster than a 1Gb card (can't remmeber make, probably SanDisk) that was with my Universal, that was sloooow...
sorry that that doesnt really answer your question, but in my opinion i think that there isn't much gain in opting for the Ultra MicroSD card, as there's not anything wrong with the standard one!
Comparing performance with different flash cards, be sure they are formatted with the same file system (FAT16/FAT32) and the same cluster size. Instead, your comparision results ae meaningless.
Lurker0 said:
Comparing performance with different flash cards, be sure they are formatted with the same file system (FAT16/FAT32) and the same cluster size. Instead, your comparision results ae meaningless.
Click to expand...
Click to collapse
And what are the best in your opinion? (cluster size and 16/32)
sergiopi said:
And what are the best in your opinion? (cluster size and 16/32)
Click to expand...
Click to collapse
I'd suggest you to search for existing threads and articles.
There is no a one-for-all solutions. One thing that I'd recommend is to format with one FAT copy (again, do a search). Then, the bigger the cluster size, the better berformance, but, OTOH, the more space is wasted. With a statistics provided e.g. by SK Tools anybody may make their decision on how to balance. SK Tools also a good tol to format cards with.
As for FAT16 vs FAT32, this is the last thing to decide. If a chosen cluster size allows FAT16 for the card, better to use it. If it does not - you have no a choice but to use FAT32. The only drawback of FAT16 is a fixed root directory size, which is not a big isue with large (16K to 64K) cluster sizes required for FAT16 on big cards.
But the main point for this thread still is: comparing flash card speeds, use the same format parameters.
Had anyone done this kind of comparison on different micro sd cards?
It imaging that this level of testing is about pointless, the typical bottleneck here is likely to be the reader device, not the card.
The phone will likely be the slowest aspect, at least when compared to a desktop reader...
You might find a turtle that can sprint, but it will still be a turtle
Hi all,
For android on TP2 (rhodium 400 for my case), would it be worth upgrading to a 4GB SDHC to run the android files?
Would it be noticeably faster?
I see 4GB microSDHC goin for about $8 on Amazon, and I might go for one if it makes any difference in android performance. Anybody's opinions?
Currently I have 2GB (I think class 1).
Thanks in advance.
mike92585 said:
Hi all,
For android on TP2 (rhodium 400 for my case), would it be worth upgrading to a 4GB SDHC to run the android files?
Would it be noticeably faster?
I see 4GB microSDHC goin for about $8 on Amazon, and I might go for one if it makes any difference in android performance. Anybody's opinions?
Currently I have 2GB (I think class 1).
Thanks in advance.
Click to expand...
Click to collapse
If it's not an SDHC (or better) card it's technically "classless". At any rate, I doubt seriously that you'd see any better performance on it. I have a 2gb "classless" card and an 8gb class4 card, and honestly Android runs about the same on either card...
mike92585 said:
Hi all,
For android on TP2 (rhodium 400 for my case), would it be worth upgrading to a 4GB SDHC to run the android files?
Would it be noticeably faster?
I see 4GB microSDHC goin for about $8 on Amazon, and I might go for one if it makes any difference in android performance. Anybody's opinions?
Currently I have 2GB (I think class 1).
Thanks in advance.
Click to expand...
Click to collapse
most of the 2gb cards are pretty good in speed, name-brand manufacturers didn't have to put a class on it - i get around 19mb/s read, 10mb/s write on my sandisk 2gb.
anything more - 4gb/8gb/16gb/32gb have classes because they had to do some tweaking for the sdhc specifications, with classes meaning minimum sequential write (C2, C4, C6, C10 = minimum 2mb-4mb-6mb-10mb/s sequential write). obviously, there are some cards that could perform faster than their minimum write speed (my sandisk 32gb C2 does 5.5mb/s write, and my a-data 16gb C4 does 9mb/s write)
just don't get a crappy generic
Mine must be classless. I am not exactly sure how fast my 2gb is, but it's at a decent speed. When I transfer about 200 mb files, it takes me about a minute roughly. I will just stick to my 2gb then.
Saves me $8 bucks! Thanks to both.
hi ive got a genuine 32gb samsung class 10 micro sd that i ordered from play.com im doing some speed test and im only getting 13mb read and 11mb write speeds would it be because im using a old sd card reader?
thanks in advance
exfat as you can transfer files above 4gb if you are going to watch 720p movies or even 1080p movies. fat32 restricts you to only 4gb files. so yh exfat all the way. i think the siyah kernel can read ntfs, im not too sure. But yh exfat is the way to go.
Are you talking Mb (Megabit) or MB (Megabyte, 1MB = 8 Mb)
(The first letter is always in upper, since a lower-case m means milli which equals 0.001 instead of Mega which equals 1'000'000)
I'd guess MB: Class-10 cards have a minimum Write speed of 10 MB/s so you're still in the boundaries.
Also note that a card that has once been filled already is slower than a "virgin" card.
But of course old SD-card readers can make a difference.