> Is there a command line tool to read a sector from harddisk,
> store it somewhere and write it back later?

While not user-friendly at all, you can use DEBUG for
this as long as the sector is inside a FAT formatted
partition. Old DEBUG versions do not support FAT32.

If the sector is the MBR, then you probably find quite
a few free existing tools for backup and restore of MBR.


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