Bug#189249: ITP: ddrescue -- Like dd, dd_rescue does copy data from one file or block device to another
Hi Steve, > The long description is not a place for a discussion on how the program > works, particularly one that begins the middle (what "latter three > features"? I don't see any features listed). well I thought that is clear enough throw the long describtion, and I am sorry for that, anyway let me explain :) ddrescue does copy data from one file or block device to another ddrescue it is a tool to help you to save data from crashed partition. It tries to read and if it fails, it will go on with the next sectors, where tools like dd will fail. If the copying process ist interrupted by the user, it is possible to continue at any position later. It can copy backwards. it is a recover tool not like dd which it is mainly convert tool and used as recover tool. So ddrescue tries to recover as much data as possible from defect harddisks. cheers Ayman -- +-+ .~. .~. / O \ / ^ \ (| |) /| |\ '\ /` `\ /` ^`^ ^`^ Ayman Negm gpg-Key: 0x63E8BE82 +-+
Bug#189249: ITP: ddrescue -- Like dd, dd_rescue does copy data from one file or block device to another
On 16-Apr-03, 04:11 (CDT), Ayman Negm <[EMAIL PROTECTED]> wrote: > Package: wnpp > Version: unavailable; reported 2003-04-16 > Severity: wishlist > > > * Package name: dd_rescue > Version : 1.0.2 > Upstream Author : Kurt Garloff <[EMAIL PROTECTED]> > * URL : http://www.garloff.de/kurt/linux/ddrescue/ > * License : GPL > Description : dd_rescue does copy data from one file or block device to > another > > >From homepage: > > The latter three features make it suitable for rescuing data from a > medium with errors, i.e. a hard disk with some bad sectors. > Why? > [*snip*] The long description is not a place for a discussion on how the program works, particularly one that begins the middle (what "latter three features"? I don't see any features listed). Steve -- Steve Greenland The irony is that Bill Gates claims to be making a stable operating system and Linus Torvalds claims to be trying to take over the world. -- seen on the net
Bug#189249: ITP: ddrescue -- Like dd, dd_rescue does copy data from one file or block device to another
On Wed, Apr 16, 2003 at 11:11:17AM +0200, Ayman Negm wrote: > * Package name: dd_rescue > Version : 1.0.2 > Upstream Author : Kurt Garloff <[EMAIL PROTECTED]> > * URL : http://www.garloff.de/kurt/linux/ddrescue/ > * License : GPL > Description : dd_rescue does copy data from one file or block device to > another Please don't repeat the package name in the description. Instead: > Description : copy data from one file or block device to another Hamish -- Hamish Moffatt VK3SB <[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
Bug#189249: ITP: ddrescue -- Like dd, dd_rescue does copy data from one file or block device to another
Package: wnpp Version: unavailable; reported 2003-04-16 Severity: wishlist * Package name: dd_rescue Version : 1.0.2 Upstream Author : Kurt Garloff <[EMAIL PROTECTED]> * URL : http://www.garloff.de/kurt/linux/ddrescue/ * License : GPL Description : dd_rescue does copy data from one file or block device to another >From homepage: The latter three features make it suitable for rescuing data from a medium with errors, i.e. a hard disk with some bad sectors. Why? * Imagine, one of your partitions is crashed, and as there are some hard errors, you don't want to write to this hard disk any more. Just getting all the data off it and retiring it seems to be suitable. However, you can't access the files, as the file system is damaged. * Now, you want to copy the whole partition into a file. You burn it on CD-Rom, just to never loose it again. You can setup a loop device, and repair (fsck) it and hopefully are able to mount it. * Copying this partition with normal Un*x tools like cat or dd will fail, as those tools abort on error. dd_rescue instead will try to read and if it fails, it will go on with the next sectors. The output file naturally will have holes in it, of course. You can write a log file, to see, where all these errors are located. * The data rate drops very low, when errors are encountered. If you interrupt the process of copying, you don't loose anything. You can just continue at any position later. The output file will just be filled in further and not truncated as with other Un*x tools. * If you have one spot of bad sectors within the partition, it might be a good idea, to approach this spot from both sides. Reverse direction copy is your friend. * The two block sizes are a performance optimization. Large block sizes result in superior performance, but in case of errors, you want to try to salvage every single sector. So hardbs is best be set to the hardware sector size (most often 512 bytes) and softbs to a large value, such as the default 16k. It will be uploaded soon by my sponsor Gerfried Fuchs. Regards Ayman -- System Information: Debian Release: testing/unstable Architecture: i386 Kernel: Linux matrix 2.4.18-bf2.4 #1 Son Apr 14 09:53:28 CEST 2002 i686 Locale: [EMAIL PROTECTED], [EMAIL PROTECTED] -- +-+ .~. .~. / O \ / ^ \ (| |) /| |\ '\ /` `\ /` ^`^ ^`^ Ayman Negm gpg-Key: 0x63E8BE82 +-+
