Well actually there is a penalty but it is not worth defragmentation IMO. The thing is that SD/MMC cards have two commands for both reading and writing - one reads/writes single block (512 bytes) and one reads/writes multiple blocks. Multiblock commands are faster due to less overhead both for computer<->card communication and for on card internal SD/MMC controller<->NAND flash. This is true especially for writing when the card can optimize NAND memory erasing/writing by merging more writes of smaller blocks into one. With single block commands card is busy after each command which slows things down and for writing this also may result in extra work done.Senor Quack said:
With ext3 you don't need to care about doing fsck at boot time when device crashed previously. This is especially useful if the system has no e2fsck binary or startup scripts do not handle it or there is no keyboard (and framebuffer console) to interact with e2fsck - all true for Nokia internet tablets. Of course you can hack it to remount ro, do fsck -y and reboot in case filesystem was modified but using ext3 is much easier. I was using ext3 on 770 for years and did not notice performance difference between ext3 and 2 and my card did not die from excessive writes too.peca said:
That shold be possible, you can do it with a partitioning tool. Qparted or gparted are good.ish420 said:
Quite frequent misconception. jffs2 is NOT suitable for memory cards, they already hide raw flash memory behing block layer so jffs2 features are almost worthless here. Also if anyone would actually try before suggesting it to someone he would find it is pretty hard to make it running (you need to add mtd over block device emulation so there are 2 layers canceling each other). Also jffs2 is pretty bad/slow with media size over few hundreds of megabytes.ati said:
That's in fact what I was thinking about: flash cards don't write linearily (is that even a word?), but do what the card's firmware tells them.Benjiro said:
It said that there was 5GB used, or 55GB free? If the later, then it's already been explained above - A 60GB drive contains ~55GB of space.Crasherball said:
Karel Jansens said:
Actually, to my knowledge, only SD cards do this.Squidge said:
and MMC cards are direct access to the NAND flash and would benefit greatly from an FS with built in wear leveling. I wasn't able to find any info on how Sony MemoryStick handles it.Maybe you mean SmartMedia, not MMC. MMC is same as SD in this regard. SmartMedia indeed is (or was) pure NAND device with no controller.WizardStan said:
fanoush said:Maybe you mean SmartMedia, not MMC. MMC is same as SD in this regard. SmartMedia indeed is (or was) pure NAND device with no controller.
Actually, I thought I was thinking of MMC. I was under the impression that it was SD minus all fancy controller and stuff that made SD better, although now that I think about it, I have no idea why I thought that, so you're probably right. I apologize. (That's way more thinking than I'm used to.)
I had completely ignored SmartMedia for the sake of my post. Seriously, who uses SM cards these days? No one, that's who. According to Wiki, they were discontinued years ago. Dead format walking!
uh oh, don't let the GP32 crowd hear you say that. :lol: i have an almost new 128MB SmartMedia card jammed in an old mp3 player somewhere around here, but aside from that i haven't seen one in years.WizardStan said:Seriously, who uses SM cards these days? No one, that's who. According to Wiki, they were discontinued years ago. Dead format walking!
WizardStan said:Seriously, who uses SM cards these days? No one, that's who. According to Wiki, they were discontinued years ago. Dead format walking!
Blasphemy, I have 2 working GP32 Blu`s that i still use, And have 6 SMC`s that i use with them, Though i have recently gone over to XD cards via an SMC to XD card convertor, In addition to the standard SMC`s as they are pretty (expensive and) hard to find.WizardStan said:fanoush said:Maybe you mean SmartMedia, not MMC. MMC is same as SD in this regard. SmartMedia indeed is (or was) pure NAND device with no controller.
Actually, I thought I was thinking of MMC. I was under the impression that it was SD minus all fancy controller and stuff that made SD better, although now that I think about it, I have no idea why I thought that, so you're probably right. I apologize. (That's way more thinking than I'm used to.)
I had completely ignored SmartMedia for the sake of my post. Seriously, who uses SM cards these days? No one, that's who. According to Wiki, they were discontinued years ago. Dead format walking!
I was told MMC is (mostly) SD without the DRM chippery. MMC was first, and MMC cards should work in every SD slot.
Karel Jansens said:WizardStan said:fanoush said:Maybe you mean SmartMedia, not MMC. MMC is same as SD in this regard. SmartMedia indeed is (or was) pure NAND device with no controller.
Actually, I thought I was thinking of MMC. I was under the impression that it was SD minus all fancy controller and stuff that made SD better, although now that I think about it, I have no idea why I thought that, so you're probably right. I apologize. (That's way more thinking than I'm used to.)
I had completely ignored SmartMedia for the sake of my post. Seriously, who uses SM cards these days? No one, that's who. According to Wiki, they were discontinued years ago. Dead format walking!
I was told MMC is (mostly) SD without the DRM chippery. MMC was first, and MMC cards should work in every SD slot.
BEWARE the same is NOT true of micro-MMC/SD. My mother has a phone with a microSD slot. I was in every shop in her local area of Spain looking for a MicroSD card for it and nothing turned up. Eventually I found a 512Mb Micro-MMC card so purchased it and it did not fit the phone.
True tale.
PSyMastR said:
I could of worded it better, I agree.WizardStan said:Actually, to my knowledge, only SD cards do this.
and SM are basically the same (raw NAND) and SM don't have a controller, but the L2P is still present, but in a driver. To determine what logical block points to what physical block, you have the read the OOB (out of band) data on each NAND page. This is not optional if you want the card to be compatible with a SM card reader. 
