Hi, Not so good news. The current rate went down to 32kb after a while. I checked fdisk again and it reported that the problem harddisk has invalid partition. Disconnecting and reconnecting the USB cable will bring up the current rate to 20MB/s for a while. Any idea how I can sustain the current rate of 20MB/s without disconnecting and connecting the harddisk USB cable?
ddrescue status: Press Ctrl-C to interrupt Initial status (read from logfile) rescued: 253107 MB, errsize: 0 B, errors: 0 Current status rescued: 255922 MB, errsize: 0 B, current rate: 32768 B/s ipos: 255922 MB, errors: 0, average rate: 799 kB/s opos: 255922 MB, time from last successful read: 0 s Copying non-tried blocks... Fdisk -l : Disk /dev/sdf: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x6058418b Disk /dev/sdf doesn't contain a valid partition table r...@microknoppix:~/Desktop/ddrescue-1.13/ddrescue-1.13# ./ddrescue -n /dev/sdf /media/sdc1/rescue.img /media/sdc1/rescue.log Thanks. regards, Ridzham > Thanks Reon but I don't think it's a problem. > > I've disconnect the problem harddisk and connect it again without changing > any configuration. Did the ddrescue again and the current rate went up to > 20MB/s (which is much faster than 27kb/s). > > I'm very happy that the speed has very much improved. However, I noticed a > difference when I did a fdisk -l. It showed multiple partitions in the > problem hard disk. It used to have only 1 NTFS partition which was > corrupted. Any comments? > > Disk /dev/sdf: 500.1 GB, 500107862016 bytes > 255 heads, 63 sectors/track, 60801 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Disk identifier: 0xf6f93598 > > Device Boot Start End Blocks Id System > /dev/sdf1 1 63 506016 82 Linux swap / > Solaris > /dev/sdf2 152 60801 487171125 7 HPFS/NTFS > /dev/sdf3 * 64 126 506047+ 83 Linux > /dev/sdf4 127 151 200812+ 83 Linux > > regards, > ridz > > > "Reon Toerien" <[email protected]> > > > > > >> On 10 January 2011 04:39, "Reon Toerien" <[email protected]>wrote: > >> I would not connect the drives via USB, I always prefer to connect >> directly >> via PATA/SATA. >> >> On 10 January 2011 02:33, <[email protected]> wrote: >> >>> Hi Andrew, >>> >>> Tried your suggestions. There's marginal improvement current rate >>> increased to 32kb but alternates with 21kb which makes the average >>> about >>> 27kb too. >>> >>> Initial status (read from logfile) >>> rescued: 1702 MB, errsize: 0 B, errors: 0 >>> Current status >>> rescued: 1713 MB, errsize: 0 B, current rate: 21845 B/s >>> ipos: 1713 MB, errors: 0, average rate: 27198 B/s >>> opos: 1713 MB, time from last successful read: 0 s >>> >>> >>> Both source and destination are attached externally thru USB. >>> >>> I did a hardware test with Seagate tool and it did not report any >>> problem. >>> >>> regards, >>> Ridz >>> >>> >>> >>> > Hi Ridz. >>> > >>> > Maybe try not specifying cluster size? >>> > >>> > You can interrupt the current run since you have a log file. Try >>> running: >>> > >>> > ./ddrescue --v /dev/sdc /media/sde1/rescue.img >>> /media/sde1/rescue.log >>> > >>> > Maybe using synchronous or direct may help (-vDd or -vd or -vD). >>> Beyond >>> > that, maybe it's a hardware issue. How are the source and >>> destination >>> > drive attached to the computer? >>> > >>> > Andrew >>> > >>> > >>> > >>> > >>> > --- On Sun, 1/9/11, [email protected] <[email protected]> wrote: >>> > >>> > From: [email protected] <[email protected]> >>> > Subject: Re: [Bug-ddrescue] Need help - ddrescue very slow - avg >>> 27kb/s >>> > To: [email protected], [email protected] >>> > Received: Sunday, January 9, 2011, 5:16 PM >>> > >>> > Hi Andrew, >>> > >>> > Thanks for replying. I was initially recovering to an NTFS >>> filesystem. >>> The >>> > average rate never went higher than 27kb. I've read that writing a >>> large >>> > file to NTFS filesystem can get progressively slower. Therefore, I >>> > formated my recovery harddisk to ext3. However, there was no >>> improvement >>> - >>> > the average rate is still 27kb and the current rate never go beyond >>> 30kb. >>> > >>> > For the recovery harddisk, I had formatted it following the >>> instructions >>> > at >>> > >>> http://www.idevelopment.info/data/Unix/Linux/LINUX_PartitioningandFormattingSecondHardDrive_ext3.shtml >>> > >>> > Result of mount of the recovery harddisk: >>> > /dev/sde1 on /media/sde1 type ext3 >>> > (rw,nosuid,nodev,relatime,errors=continue,data=writeback) >>> > >>> > regards, >>> > Ridz >>> > >>> > >>> >> Hi Ridz. >>> >> >>> >> What do you mean by "I've formatted it to type 83". >>> >> >>> >> Did you just change the partition type or did you actually format >>> the >>> >> filesystem? I ask because writing a large file to an NTFS >>> filesystem >>> >> can >>> >> get progressively slower. If you just changed the partition type, >>> that >>> >> will have no effect on the filesystem at all. >>> >> >>> >> In another terminal, type >>> >> mount >>> >> >>> >> and post the output. That will show what devices are moutned and >>> what >>> >> filesystem is in use. >>> >> >>> >> Regards, >>> >> >>> >> Andrew Zajac >>> >> >>> >> >>> >> >>> >> --- On Sat, 1/8/11, [email protected] <[email protected]> wrote: >>> >> >>> >> From: [email protected] <[email protected]> >>> >> Subject: [Bug-ddrescue] Need help - ddrescue very slow - avg 27kb/s >>> >> To: [email protected] >>> >> Received: Saturday, January 8, 2011, 9:59 PM >>> >> >>> >> Hi, >>> >> >>> >> Need help. I've ran ddrescue for a few days and it only rescued 10G >>> out >>> >> of >>> >> 500GB. I've tried various command of ddresue but I find the average >>> rate >>> >> to be very slow as compared to other examples that I've read in the >>> >> archives. I've installed ddrescue 1.8 and 1.13. I'm new to Linux and >>> I'm >>> >> not sure which version I'm using now. I've also formated my recovery >>> >> harddisk to ext3 in hope that the speed would increase. But >>> >> unfortunately >>> >> it didn't. >>> >> >>> >> My hard disks configs are as follows: >>> >> >>> >> Problem drive : /dev/sdc 500GB NTFS - Windows detected it as >>> >> unallocated >>> >> Recovery drive: /media/sde1 1TB ext3 - I've formatted it to type 83 >>> >> >>> >> Command: >>> >> >>> >> ./ddrescue --no-split --cluster-size=1024 /dev/sdc >>> >> /media/sde1/rescue.img >>> >> /media/sde1/rescue.log >>> >> >>> >> Current status: >>> >> rescued: 226559 kB, errsize: 0 B, current rate: 27594 >>> B/s >>> >> ipos: 226559 kB, errors: 0, average rate: 27431 B/s >>> >> opos: 226559 kB, time from last successful read: 0 s >>> >> >>> >> Is there anyway for me to speed up the process. >>> >> Please help. Thanks. >>> >> >>> >> regards, >>> >> Ridz >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> _______________________________________________ >>> >> Bug-ddrescue mailing list >>> >> [email protected] >>> >> http://lists.gnu.org/mailman/listinfo/bug-ddrescue >>> >> >>> >> >>> >> >>> > >>> > >>> > >>> > _______________________________________________ >>> > Bug-ddrescue mailing list >>> > [email protected] >>> > http://lists.gnu.org/mailman/listinfo/bug-ddrescue >>> > >>> > >>> > >>> >>> >>> >>> _______________________________________________ >>> Bug-ddrescue mailing list >>> [email protected] >>> http://lists.gnu.org/mailman/listinfo/bug-ddrescue >>> >> >> >> >> -- >> Kind Regards >> Reon Toerien >> __________________ >> PO Box 540 Ballito 4420 South Africa >> Tel: +27 (0) 83 270 2889 >> email: [email protected] >> > > _______________________________________________ Bug-ddrescue mailing list [email protected] http://lists.gnu.org/mailman/listinfo/bug-ddrescue
