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
