dd_rescue

Data copying in the presence of I/O Errors

dd_rescue helps when nothing else can: your disk has crashed and you try to copy it over to another one. While standard Unix tools like cp, cat, and dd will "abort" on every I/O error, dd_rescue does not. dd_rescue has many other goodies; optimization by using large blocks as long as no errors are in sight and falling back to small ones; reverse direction copy; splice in-kernel zerocopy; O_DIRECT support; preallocation with fallocate(). dd_rescue also provides data protection features by overwriting files or disks with fast random numbers, optionally multiple times. dd_rescue supports plugins; currently a hash, an lzo and a crypt plugin exist, supporting on the fly hash/HMAC calculation/validation, lzo de/compression and de/encryption. The lzo plugin is packaged in the dd_rescue-lzo, the crypt plugin in the dd_rescue-crypt subpackage.

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