11/25/2023 0 Comments Systemrescuecd dd vs ddrescueThey pad maybe 150 bytes of text with 100,000 bytes of crap Images (at least 7), just to convey a sentence or two of actualĬontent. I have a client who sends me 100kbĮmails with tiny unreadable text, a yellow background and multiple I'm sorry to sound like a knob - I do admit to having a bee in myīonnet about this at the moment. You're using Gentoo, so there are plenty ofĬlients which enable you to do this: mutt, pine, Thunderbird, Gmail imposes this html upon you then I suggest you use IMAP to access Left: 1px solid margin: 0pt 0pt 0pt 0.8ex padding-left: 1ex "> to Snippet above) it's using an arbitrary html construction ("border. Text, all the quoting marks / indenting disappears because (as per the The problem I have with this is that it seems difficult in my mailĬlient to snip excessive quoting when I reply. Stroller, is this what you are referring to? Is it possible to rescue data only from this partition when under LVM? The volume group is vfda and the logical volume of interest is /dev/vfda/home which has reiserfs file system. Specifically, /dev/sda4 is a linux LVM partition. Maybe I should try to rescue only the partition /home. I would like to attempt to get a couple of files from /home that were not in the most recent backup. This failed drive is still bootable and the corruption is in the partitions /var (which I do not care) and /home these cannot be mounted. Not sure whether I should do the next step with option -r 1. Opos: 58860 MB, time from last successful read: 0 sĭdrescue: write error: Input/output errorĬomparing with the screen output at the time of my first post,Ĭurrent status rescued went from 58656 MB to 58811 MB, errsize went from 4408 kB to 48909 kB.ĭon't know how the write error: Input/output error message affect the data in the new drive copied to. Rescued: 58811 MB, errsize: 48909 kB, current rate: 83 B/s Getting *some* of the blocks showing as failed when you run it on yourĭrive, but don't be too disheartened if you don't. It had been, in fact, on the old hard-drive. However the system was fine after a reboot & a `chkdsk`. Valmor: when I ran the `ddrescue -dr3` stage I had no success at all, See how if the results are readable, after running `fsck` on the I think theīest thing he can do is hold his breath, wait until its finished and TBH, I would expect reads from a badly-failing drive,īut this is an intuitive expectation, not a reasoned one. With only one unreadable block, but Valmor's drive is failing much Isn't this how hard-drives work?ĭdrescue worked fast here when I tried it here recently on a drive Multiple attempts to read the failing blocks before returning theįailure (or the data, in the case that a 2nd attempt to read the drive Having said that, it could just be that the drive _firmware) is making Work, and makes improvements, but it operates differently. I believe that GNUĭdrescue is the better version - it was inspired by garloff's original The examples given in the GNU manual page. Valmor posted (`ddrescue -n /dev/sda /dev/sdc rescued.log`) relates to I think Valmor is using GNU ddrescue, with which one makes the > that badly damaged, dd would have been no use anyway. > variable read rate, even the period of zero activity. > Doesn't ddrescue retry on blocks it cannot read? That would explain > Would any one know whether this is normal? > Sometimes the "current rate" reads 0 B/s for a long time. when you have multiple damaged copies of a file/media/disk on which you can run ddrescue one at a time, and you may be able to recover a completely error-free copy.> On Sat, 07:20:18 +0000, Valmor de Almeida wrote: ddrescue also features auto-merging of backups, i.e. So, it's always recommended to use the logfile option.ĭdrescue allows you to recover specific parts of the media/disk or an entire volume. The beauty of ddrescue is when you use the logfile feature, which can be used to resume to the data recovery in case it was interrupted due to some reason. Also, ddrescue's algorithm is such that it'll read the 'good' areas of the media first and schedule the 'bad' areas for later which increases the chances of recovering maximum possible data from an already failing media/hard disk. and will provide you with all the data that could be salvaged. Generally, CD & DVD media retain data correctly for a few years (or more, depending on the quality of the media), after which data loss starts slowly with read errors increasing from the outer tracks of the media towards the innermost track.ĭdrescue is a GNU tool for data recovery, it copies data from a file/block devices (cd,dvd,hard disk,flash drive,etc.) to another attempting to recover from read errors, bad sectors, etc. It might happen that your hard disk died on you, or the DVD backup you had does not read correctly.
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