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Files saved on SD card dont show on PC

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neil:
Hi Mark,
  I am using the latest version of the SD source, v2.01 with changes to some SD cards where they didn't format.    These cards are formatted as FAT32, and the files are created and read ok when connected to the processor. When I remove the card and place in the PC , it says the card is empty. The properties shows that 1.5MB has been used, but now files are displayed.

Regards
Neil

mark:
Hi Neil

I haven't heard of such an effect. Is this reproducible with all cards or just a few?

What you could do is use the HDD Raw Copy Tool "HDDRawCopy V1.1" to make an image of the card and send it to me. I can then copy the exact image to a card (including one that sent me that was causing initialisation problems) so that I can see it happening and possible explain it.

Regards

Mark

neil:
Hi Mark
  The 2 types of cards we have are sandisk , and transcend  cards. And it happens on both types. I have attached the file.

Regards
Neil

neil:
Hi Mark
  Any luck with the file?

Regards
Neil

mark:
Neil

I have used this to create an image on a 4GByte SanDisk card.

In the PC I see it as a disk called "QWIKDISK" with no data on it.

When I insert it into a Kinetis board (SDHC) I see this as info:

Disk QWIKDISK (3965190144 bytes) SDHC FAT32
Bytes per sector: 512
Cluster size: 4096
Directory base: 0x00000002
FAT start: 0x0000005f
FAT size: 0x00000ef3
Number of FATs: 2
LBA: 0x00001e45
Total clusters: 0x00077737
Info sect: 0x00000040
Free clusters: 0x00076da8
Next free: 0x00000991
CSD: 0x40 0x0e 0x00 0x32 0x5b 0x59 0x00 0x00 0x1d 0x8a 0x7f 0x80 0x0a 0x40 0x40 0x00

The "dir" commnd shows it as empty.
The "dird" command shows that there was a file deleted called "ReadyBoostPerfTest.tmp"

[D]---A 24.08.2015  11:44          8388608 ReadyBoostPerfTest.tmp
1 files with 8388608 bytes
0 directories, 1994031104 bytes free


When I then analyse this file with the "infod" command I get:

D:\>infod ReadyBoostPerfTest.tmp
File: ReadyBoostPerfTest.tmp is LFN
Starting at entry 0x04 in sector 0x00001e45 (cluster 0x00000002)
Deleted LFN
Data = 0xe5 0x66 0x00 0x54 0x00 0x65 0x00 0x73 0x00 0x74 0x00 0x0f 0x00 0x49 0x2e 0x00 0x74 0x00 0x6d 0x00 0x70 0x00 0x00 0x00 0xff 0xff 0x00 0x00 0xff 0xff 0xff 0xff
Deleted LFN
Data = 0xe5 0x52 0x00 0x65 0x00 0x61 0x00 0x64 0x00 0x79 0x00 0x0f 0x00 0x49 0x42 0x00 0x6f 0x00 0x6f 0x00 0x73 0x00 0x74 0x00 0x50 0x00 0x00 0x00 0x65 0x00 0x72 0x00
Deleted LFN
End
SFN File located at entry 0x06 in sector 0x00001e45 (cluster 0x00000002)
Data = 0xe5 0x45 0x41 0x44 0x59 0x42 0x7e 0x31 0x54 0x4d 0x50 0x20 0x00 0x49 0x87 0x5d 0x18 0x47 0x18 0x47 0x00 0x00 0x89 0x5d 0x18 0x47 0x91 0x01 0x00 0x00 0x80 0x00
SFN name (archive) = .EADYB~1TMP Alias CS = 0x49
File length = 8388608 starting in sector 0x00002abd (cluster 0x00000191) FAT sector 0x00000062 offset 0x11

Finally, I check the sector content (0x1e45) where the deleted file object is located:

sect 1e45
Reading sector 0x00001e45
 0x57205141 0x2e006265 0x0872452e 0x60000000 0x44eb44eb 0x60000000 0x000044eb 0x00000000 0x49002042 0x66006e00 0x0f006f00 0x00727200 0x0061006d 0x00690074 0x0000006f 0x0000006e
 0x79005301 0x74007300 0x0f006500 0x006d7200 0x00560020 0x006c006f 0x00000075 0x0065006d 0x54535953 0x317e4d45 0x16202020 0x5d6f6800 0x47184718 0x5d700000 0x018f4718 0x00000000
 0x540066e5 0x73006500 0x0f007400 0x002e4900 0x006d0074 0x00000070 0x0000ffff 0xffffffff 0x650052e5 0x64006100 0x0f007900 0x00424900 0x006f006f 0x00740073 0x00000050 0x00720065
 0x444145e5 0x317e4259 0x20504d54 0x5d874900 0x47184718 0x5d890000 0x01914718 0x00800000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000

Here I see the same data content and no other file objects (following are only 0x00000000).

Therefore, it looks like there is really no data on the card (once the original single file was deleted).

Could you do the same to see whether there is a difference? What do your see on the card? If you find files on it can you use the "infof" to see its location on the disk so that I can check whether it is on it somewhere?

Regards

Mark

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