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Does OS X corrupt files when copying from SD card to desktop?

573 Views 6 Replies Latest reply: Apr 6, 2014 10:05 PM by Jerimiah Baldwin RSS
Jerimiah Baldwin Calculating status...
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Apr 3, 2013 8:35 AM

Using finder to copy a folder and its files from SD card to mac desktop seems to cause *some* files to be corrupted, specifically a handful of MP4 files from a FAT32 SD card  which was used in a digital camera. Using a binary/hex comparison tool reveals that some segments of the files contents were modified when copied from the SD card. 



This error occurs when copying multiple files using Finder windows.  However, when copying the same files one at a time, the corruption does not occur.  This appears to be an OS level bug.  In reviewing past content, I found that dozens of MP4 files have been corrupted in the past 4 months by merely copying the files from the SD card to mac desktop using Finder copy/paste.


I am using OS X Mountain Lion 10.8.3

MacBook Pro, OS X Mountain Lion (10.8.3)
  • sig Level 8 Level 8 (35,770 points)

    When you say corrupted, modified exactly what do you mean?

  • sig Level 8 Level 8 (35,770 points)

    Is that your criteria? Byte size? That'll change depending upon the size of the media the file resides in. It does not mean the file is corrupted nor an OS X bug. So the same file on a 750 GB drive will occupy a different space than on a 8 GB SD card.

  • Daniel Silber Level 1 Level 1 (10 points)

    Hi Jermiah,


    did you ever find the cause for this or solve it?


    I seem to ba having a similar problem.




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