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Diffstat (limited to 'README')
| -rw-r--r-- | README | 17 |
1 files changed, 10 insertions, 7 deletions
@@ -2,11 +2,13 @@ Description Lziprecover is a data recovery tool and decompressor for files in the lzip compressed data format (.lz), able to repair slightly damaged -files, recover badly damaged files from two or more copies, extract data -from damaged files, decompress files and test integrity of files. +files, produce a correct file by merging the good parts of two or more +damaged copies, extract data from damaged files, decompress files and +test integrity of files. -The lzip file format is designed for long-term data archiving, taking -into account both data integrity and decoder availability: +The lzip file format is designed for data sharing and long-term +archiving, taking into account both data integrity and decoder +availability: * The lzip format provides very safe integrity checking and some data recovery means. The lziprecover program can repair bit-flip errors @@ -21,8 +23,8 @@ into account both data integrity and decoder availability: extract the data from a lzip file long after quantum computers eventually render LZMA obsolete. - * Additionally lzip is copylefted, which guarantees that it will - remain free forever. + * Additionally the lzip reference implementation is copylefted, which + guarantees that it will remain free forever. A nice feature of the lzip format is that a corrupt byte is easier to repair the nearer it is from the beginning of the file. Therefore, with @@ -61,7 +63,8 @@ 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. +approaches 100 percent even with only two copies. (Supposing that the +errors are randomly located inside each copy). Lziprecover is not a replacement for regular backups, but a last line of defense for the case where the backups are also damaged. |