Hi Florian,

Florian Sedivy wrote:
I propose to concentrate on the raw format, just as those allocation
bitmaps are stored on the drive by the respective filesystem
specifications. That makes ddrescuelog independent of the possibly
proprietary formats some tools would use to store backups of them. More
importantly it allows reading or writing those bitmap files with direct
disk access tools - like ddrescue.

Even concentrating on the raw format seems to need a lot of research work. For example, given an image of a partition with a file system of type ext3, what is the command required to read the block bitmap(s) from the image using ddrescue? What is the mapping between file system blocks and drive sectors?

As time permits, I'll try to investigate this for ext2/3/4 file systems. Concrete data (command used and format of resulting bitmap file) for these or other types are welcome.

Best regards,

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