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June 5, 2018 16:36
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Cheap and cheerful image recovery from a corrupted SD card that keeps unmounting itself
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| # usage: | |
| # sudo python reader.py /dev/disk2s2 path-to-my-image.img | |
| # | |
| # keep re-inserting the card and hitting enter as instructed | |
| import os.path | |
| import sys | |
| infile = sys.argv[1] | |
| outfile = sys.argv[2] | |
| with open(outfile, 'wb') as ofh: | |
| blocks_read = 0 | |
| while True: | |
| try: | |
| ifh = open(infile, 'rb') | |
| except (IOError, OSError): | |
| raw_input('Failed to open. Reinsert and press enter.') | |
| continue | |
| try: | |
| ifh.seek(blocks_read * 512) | |
| except IOError: | |
| raw_input('Failed to seek. Reinsert and press enter.') | |
| continue | |
| try: | |
| d = ifh.read(512) | |
| except IOError: | |
| print('block {:06d}: skipped'.format(blocks_read)) | |
| ofh.write('\00' * 512) | |
| # close the file to free the handle - if left open it holds the volume mounted | |
| # even if it has become unreadable. closing the file at this point allows it to | |
| # unmount if it thinks it needs to. | |
| ifh.close() | |
| try: | |
| os.stat(infile) | |
| except (IOError, OSError): | |
| raw_input('Failed to read. Reinsert and press enter.') | |
| else: | |
| print('block {:06d}: read'.format(blocks_read)) | |
| ofh.write(d) | |
| ofh.write('\00' * (512 - len(d))) | |
| blocks_read += 1 |
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