With -4 SEED/SEEDFILE you get an additional random pass (r,ir,r2,0). Likewise, -3 SEED/SEEDFILE will overwrite ofile 3 times (r,ir,0, BSI M7.15). Using /dev/urandom as SEEDFILE gives good pseudo random numbers. Instead of infile, -z/Z SEED or -z/Z SEEDFILE may be specified, taking the PRNGįrom libc or frandom (RC4 based) as input. F offr/repw/rep] fault injection (hardbs off) r/w Y oname Secondary output file (multiple possible), C limit rateControl: avoid xfer data faster than limit B/s p preserve: preserve ownership, perms, times, attrs (def=no), f force: skip some sanity checks (def=no), i interactive: ask before overwriting data (def=no), A Always write blocks, zeroed if err (def=no), a detect zero-filled blocks and write spArsely (def=no), W read target block and avoid Writes if identical (def=no), P use fallocate to preallocate target space, k use efficient in-kernel zerocopy splice, d/D use O_DIRECT for input/output (def=no), u undo writes by deleting outfile and issuing fstrim
T truncate output file at last pos (def=no), t truncate output file at start (def=no), R repeatedly write same block (def if infile is /dev/zero), o bbfile name of a file to log bad blocks numbers (def=""), l logfile name of a file to log errors and summary to (def=""), y syncsz frequency of fsync calls in bytes (def=512*softbs), x count opos from the end of outfile (eXtend), m maxxfer maximum amount of data to be transferred (def=0=inf), e maxerr exit after maxerr errors (def=0=infinite), B hardbs fallback block size in case of errs (def=4096, 512 for -d), b softbs block size for copy operation (def=131072, 1048576 for -d), S opos start position in output file (def=ipos), Options: -s ipos start position in input file (default=0), It's protected by the terms of GNU GPL v2 or v3ĭd_rescue copies data from one file (or device or pipe) to others.
Use ddrescue gui free#
(features: O_DIRECT dl/libfallocate fallocate splice fitrim xattr rdrnd avx2)ĭd_rescue is free software. Start at position 100 of the input file ( -s 100 /var/log/messages) and write, beginning at position 0 of the destination file ( -S 0 /tmp/ddrescue-out): :~# dd_rescue -s 100 /var/log/messages -S 0 /tmp/ddrescue-outĭd_rescue: (info): Using softbs=65536, hardbs=4096ĭd_rescue: (info) expect to copy 1766kB from /var/log/messagesĭd_rescue: (info): ipos: 1024.1k, opos: 1024.0k, xferd: 1024.0kĮrrs: 0, errxfer: 0.0k, succxfer: 1024.0k DARK Tool Documentation: dd_rescue Usage Example
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