SD or MMC card as storage for logging

[SOMRU]

mybad...
try this

http://www.roguerobotics.com/products/electronics/ummc

good luck.

[Chris Barron]

mybad...
try this

http://www.roguerobotics.com/products/electronics/ummc

good luck.

Yep thats neat , especially if you are pushed for space.

The SDFS software in picbasic doesn't require any other hardware though, apart from a socket for the card In my case I recovered one from a broken SD card reader (New ones cost less than £1 !), so it cost me nothing to get basic SD functionality

[mackrackit]

Yep thats neat , especially if you are pushed for space.

The SDFS software in picbasic doesn't require any other hardware though, apart from a socket for the card In my case I recovered one from a broken SD card reader (New ones cost less than £1 !), so it cost me nothing to get basic SD functionality

And the support from MeLabs can not be beat. A month or so ago I found a problem with APPEND. I am not good enough with FAT16 to fix it myself, so I told Jeff about it and now it is fixed. That is why it is now SDFS3. Where else can you get support like that?

I have tested SDFS more ways than I can count, even wore a SD card out reading and writing over and over.

SDFS just plain works.

[Luckyborg]

Out of curiosity how many read/writes do you think you got out of that card. I'm always curious as to how accurate data sheets are for things like that, which I can't actually measure practically.

David

[Jerson]

Could anyone using the SFS3 please enlighten me on the amount of flash/ram it consumes? I cannot check it since I do not have PBPL yet.

thanks

[mackrackit]

Could anyone using the SFS3 please enlighten me on the amount of flash/ram it consumes? I cannot check it since I do not have PBPL yet.

thanks

Here is what I have on a basic setup.
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=3295&stc=1&d=123865124 3">

Out of curiosity how many read/writes do you think you got out of that card. I'm always curious as to how accurate data sheets are for things like that, which I can't actually measure practically.

David

That is a hard question.

The card that failed was an old 64 MB. Well used to begin with.
When I first started playing with SDFS I was using a 1 GB card, that is when there was an append problem. I tried several cards as not all manufactures sizes are the same. The append problem was SDFS would not append a file past the sector the file originated in. It would write multiple file though. I got to testing with the 64MB card. The first sector took a beating. Fill the sector, erase or format, bang on the keyboard some more...

I do not have any idea how many times I did this.

After Jeff fixed the problem, skimask and I was doing some write speed test. I set up a loop to write 8 bytes, read, append 8 more, read... This particular card was running that loop at 3.55Hz.

The way I understand it, the MBR is in the first sector, more abuse.

I think I was about 4 hours into that test before failure.

[mister_e]

In theory it has to be something like 10K writes cycles, and it depends of the brand. But how 10K is 10K... that's another story

[mackrackit]

Could anyone using the SFS3 please enlighten me on the amount of flash/ram it consumes? I cannot check it since I do not have PBPL yet.

thanks

The attachment did not attach the last time??
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=3297&stc=1&d=123868043 6">

[Jerson]

thank you Dave