When attempting to backup and restore a compressed device mode image (.imz) I get an error 'invalid device mode image'. Backing up the same USB key to an uncompressed image (.ima) and then restoring this works fine.
Is there something I am missing or is this a bug?
I couldn't recreate the error here. Maybe some more information can held me solve that issue. What is the uncompressed image file? When compressing the image, take a compression tool (WinZip, WinRAR) and open the archive. That do these tools say about the stored images file size? The uncompressed image size must be a multiple of 512, otherwise these error will appear.
I have done some testing and the fault appears to be with the compression process, as I am unable to unzip this particular .imz with 7-zip (reports 'not a valid archive').
I have backed up this USB key to .imz several times to different files to prove it was not a one-off issue with the image file - none of them can be opened with 7-zip.
I have successfully completed a compressed image backup and restore from a different smaller USB key, as well as confirming this .imz can be opened in 7-zip, so the process does work in general.
The 'problem' USB key is a 4GB model - is this perhaps too close to the 4GB filesize limitation in your compression module? Is there anything else you'd like me to test?
Thanks for your work in recreating this problem. It would be helpful, if you can tell me the exact image size in bytes. Then I can test just the compression routines with an empty dummy image file.
usb key size: 4,016,046,080 volume type FAT32, size: 4,007,653,376, 'corrupt' compressed image size: 2,186,246,991
Version 1.56 will fix this issue. Seems there has been something wrong with minizip, that has been fixed together with the new zlib version.
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