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Old 11-29-2013, 07:03 PM   #1
swamp thing
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Checksum mismatch on Read-back from uSD

[1]Used Win32-Imager to make an image of the internal SD card
[2] Copied the image into a new card
[3] Immediately read back from new card into another image file.
[4] Compared the MD5 checksums of the two images -- they do not match.

Is this normal? ... Or, it corrupted data waiting to brick my Kobo whenever it hits the bad part? [Note that the new card does work on the device, only much slower].

Thanks,
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Old 11-29-2013, 10:33 PM   #2
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If the imaging program is creating a raw image, and the cards are the same size, then the image you read back should be byte-for-byte identical to the image you wrote so the checksums should match.

I haven't used win32-imager, but if it is this program http://sourceforge.net/projects/win32diskimager/ then it says it creates raw images.
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Old 11-29-2013, 11:03 PM   #3
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Quote:
Originally Posted by GeoffR View Post
... but if it is this program http://sourceforge.net/projects/win32diskimager/ then it says it creates raw images.
Yes, that's the one I used.
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Old 11-30-2013, 04:32 AM   #4
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Well, often cards differ in the exact number of sectors, this could be the cause. If it works, I wouldn't worry too much.
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Old 12-01-2013, 08:46 AM   #5
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Thanks, giorgio130.

I checked the disk sizes and yes, they were a bit different.
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