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Hi all, |
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|
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recently my SD card just went bonkers. Unfortunately I lost a lot of |
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photos on it (backups are useless until the data actually gets to the |
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backup...) but fortunately I was able to use a program to recover about |
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170 photos. |
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|
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Anyway, I don't know if it was just static, shock, dead card, or phase |
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of the moon, so I would like to see if the card is good before I |
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continue to use it. |
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|
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I've reformatted it and I get: |
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$ df |
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Filesystem 1K-blocks Used Available Use% Mounted on |
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/dev/mmcblk0p1 500960 500960 0 100% /media/PICS |
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|
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so I created a file: |
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dd if=/dev/urandom of=Desktop/random.img bs=1024 count=500960 |
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|
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then copied it to the card, and then copied it back as random-2.img. If |
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I md5sum the two files, they are identical: |
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$ md5sum random* |
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9dcac25cfd8585be5939c0ff969de310 random-2.img |
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9dcac25cfd8585be5939c0ff969de310 random.img |
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|
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Does that mean my memory card is good to go, or should I use some other |
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method of bad sector detection? |
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|
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It's a Lexar Media 512Mb SD card, a couple of years old. Yes I know I |
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can get a cheap 2Gb for <$20 but I'm more interested in the principle of |
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the test :) |
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|
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thanks for any tips! |
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-- |
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Iain Buchanan <iaindb at netspace dot net dot au> |
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|
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This sentence contradicts itself -- no actually it doesn't. |
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-- Douglas Hofstadter |