磁盘数据恢复工具-gnu ddrescue
2014-03-11 14:55:33 
阿炯
GNU ddrescue (dd rescue, dd_rescue)是一个磁盘数据恢复工具，采用C语言开发在GPLv3协议下授权。Ddrescue - Data recovery tool
GNU ddrescue is a data recovery tool. It copies data from one file or block device (hard disc, cdrom, etc) to another, trying to rescue the good parts first in case of read errors.
Ddrescuelog is a tool that manipulates ddrescue logfiles, shows logfile contents, converts logfiles to/from other formats, compares logfiles, tests rescue status, and can delete a logfile if the rescue is done. Ddrescuelog operations can be restricted to one or several parts of the logfile if the domain setting options are used.
The basic operation of ddrescue is fully automatic. That is, you don't have to wait for an error, stop the program, read the log, restart it from a new position, etc.
If you use the logfile feature of ddrescue, the data is rescued very efficiently, (only the needed blocks are read). Also you can interrupt the rescue at any time and resume it later at the same point.
Ddrescue does not write zeros to the output when it finds bad sectors in the input, and does not truncate the output file if not asked to. So, every time you run it on the same output file, it tries to fill in the gaps without wiping out the data already rescued.
Automatic merging of backups: If you have two or more damaged copies of a file, cdrom, etc, and run ddrescue on all of them, one at a time, with the same output file, you will probably obtain a complete and error-free file. This is so because the probability of having the same area damaged in all copies is low. Using the logfile, only the needed blocks are read from the second and successive copies.
最新版本：1.4
此版本进行了重构，现在允许更好的运行时间和构建时间特性检测，支持建立Android(NDK) 和快速的AVX2 sparse块检测。同时还添加了新选项：-u/--rmvtrim ，移除书面文件(通常使用 zero-filled)；添加了fstrim操作。
项目主页：http://www.gnu.org/software/ddrescue/ddrescue.html