dissapearing files from lexar 256MB SD card .... - MDA, XDA, 1010 General

one additional almost newbie question ... I have managed to put some large capacity mp3 files on my 256MB card from lexar, one over 90MB and another two - 40GB and 25GB respectively .... the thing has been though that almost overnight they have been played few times on my XDA with PPC2003 system installed ... but few hours later dissapeared form that SD according to some unigue feature
files 20-40MB are remain in-tact, only the bigger ones have been affected
any help on that??
regards,
monika

Related

Capacity of SD cards

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

Why is the memory specified on SD/MMC not all available

Can some one please tell me why when you buy a memory card you never get the amount of memory specified available to you. For example I have a 32MB card but the XDA only shows this as 30.9, a bit of a bummer as I originally bought the card for Rom upgrades but had to use a 64MB instead. Does anyone know why this is the case.
PS I am surprised that there is not a declaimer when buying these. Something like “Though this card is 32MB in size there is no guarantee that the full 32MB will be available to you”
Thanks John.
For each storage media, there is a part taken to keep track of the place and attributes of each stored file. This can range from 1% for simple media like SD and MMC to around 15% for highly protected media like RAID5 storage disks.
As a practic, always subtract 1% of the capacity or you can take the job of keeping this FAT area in your diary :lol:
sd stand for secure digital which mean that each byte have encryption possiblities this also takes up room
with harddisks it's often because they state the size in bytes and not GB or MB or what ever and to get a KB you need 1024 bytes
but i do believe that flashcards do it the more real way by stating the size in MB and GB and such
Yes, 500 megabytes is often not 500x1024 but 500x1000 which also accounts for the disparity.

How Can WALLABY Memory be increased

Wallaby has a 32 mb built in memory. How can this be increased. If so How MUCH & How?
Note i have installed a 128 mb SD card and have installed most of the softwares on it but my system shows low memory while the SD card is nearly 50% empty.
I have tried to use the slider in the settings to increase the momory but it slides back and is not releasing more memory for the system.
kindly advise how to increase the momory
regards
aamer sheikh
There is a company that adds physical ram to the phone but now that prices for the xda 1 are so low I would not consider that as a realistic option. You could maybe buy an xda 1 with 64 megs of memory and a broken screen and transplant the mother board to your phone.
I think he might not know that he might free up some memmory on his devices rom. If I were you sir, I would sync my data (not backup), hard reset, reinstall everything into where I wanted it, and resync. If you have experience with hot air rework, or have a friend, you might aquire the chips and do it yourseld. THen again, if you didn't know you could add memmory to a wallaby, then you probably shouldn't do that. Be careful and good luck!
PS I'm not responsable if you junk your device, I am only giving suggestions of what could be done, not telling you it should be done!
Even by physically adding the memory chips you can get only 64meg, anything above that has to be software driven paged memory I think, bit like using a fast sd card.
I know that 128+ mb requires a driver.... I wonder if you could get in 96 somehow???? anyone done that?
I think the hardware limits direct memory access above 64.
can the chips be stacked? I thought I had read that somewhere; cut a certain pin(s) and solder/joint a second chip ontop of the origionals?????
are the user accessable ram and rom on the same chip or are they seperate chips?
could the rom size be increased? (never looked into it)
Where would one acquire the chips?

SD Card memory Issue?

Ive got an 8GB memory card.
I've removed a hefty portion of files which in my head should leave the card under 2 gig used, however the system seems to state ive used just over half.
I cant find any other files which may use this kind of memory useage - any suggestions?

Unbelievably slow sdcard write speed!!!

the SD card I have is called SanDisk ultra 64gb class 10.
The first time I inserted into the phone, it ask to be formatted.
after a few weeks and almost filling it up full, I noticed that saving stuff on it is extremely slow.
I ran benchmark to confirm my suspicion
Sent from my EVO using xda premium
raclimja said:
the SD card I have is called SanDisk ultra 64gb class 10.
The first time I inserted into the phone, it ask to be formatted.
after a few weeks and almost filling it up full, I noticed that saving stuff on it is extremely slow.
I ran benchmark to confirm my suspicion
Sent from my EVO using xda premium
Click to expand...
Click to collapse
Ok so let me get this straight, the test file you are using is about 144MB and the only space you have left on your card is 194MB? Have you tried deleting a few files then running the test again?
Are you having any other problems. I know the phone specs says it only supports up to 32gb MicroSDHD card. The one you are using is a MicroSDXD card. I was thinking about getting one of those off amazon but there were alot of reviews from people with android phones that said it worked initially but then had all kinds of errors and problems after running the card for awhile. How long have you been using yours?
use the app SD TOOLS.. run that app and see what u get for a score...
INMHO this issue is coming from sdcard cluster size. i own a htc hero and a adata 8gb class6 sdcard.
usually ,because i use ext partition, i formatted sdcard under recovery (amonra or cm) and the cluster size is 4k . in this condition the write speed is arround 1MB/s .
studying this issue and after some digging in android i found that default cluster size is 68k ??? .... anyway using any OS or cmd line in a computer and formating with 64k cluster size will give best results regarding sdcard write speed .
with 64k cluster size i get 8-10 MB/s ....
i think the issue is coming because recovery's format the card with 4k cluster size
at least this is happen in my case with htc hero recovery's
so , just set cluster at 64k and it will work (i hope )
tachita said:
INMHO this issue is coming from sdcard cluster size. i own a htc hero and a adata 8gb class6 sdcard.
usually ,because i use ext partition, i formatted sdcard under recovery (amonra or cm) and the cluster size is 4k . in this condition the write speed is arround 1MB/s .
studying this issue and after some digging in android i found that default cluster size is 68k ??? .... anyway using any OS or cmd line in a computer and formating with 64k cluster size will give best results regarding sdcard write speed .
with 64k cluster size i get 8-10 MB/s ....
i think the issue is coming because recovery's format the card with 4k cluster size
at least this is happen in my case with htc hero recovery's
so , just set cluster at 64k and it will work (i hope )
Click to expand...
Click to collapse
Thanks Tac, this actually gave my class6 10.3write & 20.1read
jauger said:
Thanks Tac, this actually gave my class6 10.3write & 20.1read
Click to expand...
Click to collapse
@jauger ,
can you tell me what utility use for testing sdcard speed: sd tools, sdcard speed test , A1 SD bench, sdcard tester ?
sd tools give me amazing results ... outside of my sdcard class 6 range
1 SD bench is in testing stage for me
sdcard tester require adobe air and for my device generation i think is too much hassle to make it run and even if i make it run can give poor results
sdcard speed test even if is discontinued it is very close to reality and real behaviour of my sdcard
PS: regarding sdcard speed test, it would be nice to post test results only at first run of app because a 2nd test it will give higher troughput from obvious reasons

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