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Diffstat (limited to 'README')
| -rw-r--r-- | README | 22 |
1 files changed, 4 insertions, 18 deletions
@@ -1,11 +1,8 @@ Description Lziprecover is a data recovery tool and decompressor for files in the lzip -compressed data format (.lz). Lziprecover is able to repair slightly damaged -files (up to one single-byte error per member), produce a correct file by -merging the good parts of two or more damaged copies, reproduce a missing -(zeroed) sector using a reference file, extract data from damaged files, -decompress files, and test integrity of files. +compressed data format (.lz). Lziprecover also provides Forward Error +Correction (FEC) able to repair any kind of file. Lziprecover can remove the damaged members from multimember files, for example multimember tar.lz archives. @@ -13,9 +10,6 @@ example multimember tar.lz archives. Lziprecover provides random access to the data in multimember files; it only decompresses the members containing the desired data. -Lziprecover facilitates the management of metadata stored as trailing data -in lzip files. - Lziprecover is not a replacement for regular backups, but a last line of defense for the case where the backups are also damaged. @@ -59,8 +53,8 @@ GNU ddrescue + lziprecover is the recommended option for recovering data from damaged lzip files. If a file is too damaged for lziprecover to repair it, all the recoverable -data in all members of the file can be extracted in one step with the -command 'lziprecover -cd --ignore-errors file.lz > file'. +data in all members of the file can be extracted with the command +'lziprecover -cd --ignore-errors file.lz > file'. When recovering data, lziprecover takes as arguments the names of the damaged files and writes zero or more recovered files depending on the @@ -70,14 +64,6 @@ files themselves are kept unchanged. When decompressing or testing file integrity, lziprecover behaves like lzip or lunzip. -To give you an idea of its possibilities, when merging two copies, each of -them with one damaged area affecting 1 percent of the copy, the probability -of obtaining a correct file is about 98 percent. With three such copies the -probability rises to 99.97 percent. For large files (a few MB) with small -errors (one sector damaged per copy), the probability approaches 100 percent -even with only two copies. (Supposing that the errors are randomly located -inside each copy). - The lziprecover package also includes unzcrash, a program written to test robustness to decompression of corrupted data, inspired by unzcrash.c from Julian Seward's bzip2. Type 'make unzcrash' in the lziprecover source |