Mac Os X Dd Input Output Error
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Dd Input/output Error Sd Card
Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: dd error writing input output error Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Interpreting dd Input/Output error up vote 4 down vote favorite I tried to copy /dev/Storage/Storage (an LV
Dd Input/output Error Dvd
under LVM) to an image file using a dd | pv | dd pipeline. dd reported an error, and I want to know whether dd finished copying my disk or stopped due to the error. I'm not sure since it gave me two different outputs: one with an error at the top and one without. I'd take a guess and say it didn't because between the two there's only an extra 0.1 seconds and no extra data, but I'm not sure if it did "dd: /dev/rdisk3: input/output error" or not. /dev/Storage/Storage is a 1 TB disk (terabyte = 1012 = 10004) or 931.51 GiB (gibibyte = 230 = 10243) or 1953513472 sectors. The filesystem on the disk is messed up and doesn't work properly. $ sudo dd if=/dev/Storage/Storage | pv | dd of=Storage.img dd: error reading ‘/dev/Storage/Storage’: Input/output error ] 1627672400+0 records ins] [ <=> ] 1627672400+0 records out 833368268800 bytes (833 GB) copied, 75181 s, 11.1 MB/s 776GB 20:53:01 [10.6MB/s] [ <=> ] 1627672400+0 records in 1627672400+0 records out 833368268800 bytes (833 GB) copied, 75181.1 s, 11.1 MB/s linux dd share|improve this question edited Apr 27 at 15:26 Anthon 47.6k1462125 asked Aug 16 '15 at 0:08 Scoopta 199114 (1) Please show the command(s) that you typed to get this output. (2) Do you know how big you disk is? Please do not respond in comments; edit your question to provide the requested information. –Scott Aug 16 '15 at 0:36 One obvious question is whether your disk has 1627672400 sectors or not. Try blockdev --getsz /dev/whatever. If you copied the right number of sectors, then you are probably okay. –user3188445 Aug 16 '15 at 0:39 @user3188445 taking that as a no it didn't finish because it's 1953513472 sectors. –Scoopta Aug 16 '15 at 1:26 @Scott I updated my question but it's looking like it didn't finish...which means another 20+ hour copy. –Scoopta Aug 16 '15 at 1:28 Rather than using dd for this you might want to take a look a
Recover a dead hard drive using dd Mar 04, '05 07:56:00AM • Contributed by: Anonymous The Unix program dd is a disk copying util that you can use at the command line in order to make a disk image. It makes
Dd Writing To Input/output Error
a bit-by-bit copy of the drive it's copying, caring nothing about filesystem type, files, or
Input Output Error Hard Drive Mac
anything else. It's a great way to workaround the need for Norton Ghost. Normally, in order to make a disk image, the disk ubuntu input output error external hard drive you're copying from has to be able to spin up and talk -- in other words, it's OK to make a copy if the disk is healthy. But what happens when your disk is becoming a doorstop? As http://unix.stackexchange.com/questions/223444/interpreting-dd-input-output-error long as it continues to spin, even with physical damage on the drive, dd and Mac OS X will get you out of the fire. We had a situation recently where a friend sent a disk to us that had hard physical errors on it. It would boot in Windows, but then it would hit one of these scratch marks and just die. We fired up dd, and it started OK, but stopped at the same http://hints.macworld.com/article.php?story=20050302225659382 physical error location -- complaining about a Hard Error.So the workaround was to designate the dd mode as noerror -- which just slides over the hard stops, and to add the mode sync, which fills the image with nulls at that point. We did it on BSD Unix, but as long as you can get the hard drive attached to your Mac, the command is the same: dd bs=512 if=/dev/rXX# of=/some_dir/foo.dmg conv=noerror,sync The bs=512 designates block size, and the if=/dev/rXX# is the UNIX path to the actual disk device. Make sure that the chosen directory (some_dir) has enough room to take the entire disk image -- which will be equal to the size of the drive. Since dd doesn't care about the contents of the drive, it copies every bit on the thing, so you get an image equal to the disk's capacity. A really big file. One workaround is to put it on a RAID array. Once you've established the disk image (in this example, foo.dmg), you're almost home. Here's where your Mac OS X box is far and away the best thing to have. In this example, the dd output file is foo.dmg. You have to realize that this is an exact copy of a busted drive, but the "holes" are filled with nulls. As long as the damage isn't to the boot sector, though
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring http://stackoverflow.com/questions/19470160/cant-back-up-sd-card-with-dd-complains-input-output-error developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join http://www.finetunedmac.com/forums/ubbthreads.php?ubb=showflat&Number=32928 them; it only takes a minute: Sign up Can't back up SD card with dd, complains “Input/Output Error” up vote 4 down vote favorite I have successfully backed up my SD card twice by issuing the following command sudo output error dd if=/dev/sdb of=/home/user/Documents/raspi/images/raspi1.v2.iso bs=1M However, now it is giving me the following error: dd: reading `/dev/sdb': Input/output error 3027+1 records in 3027+1 records out 3174977536 bytes (3.2 GB) copied, 200.723 s, 15.8 MB/s Looking around the net, this seems to indicate a corrupted SD card. However, my raspi (which I runs off of this SD card) runs fine (ish) and Disk Utility claims that the sd card is not corrupted. Is there another way I can find out why input output error dd is complaining, if the card is corrupted, and if so, how to fix the SD card. UPDATE: I gave up trying to run dd on the SD card, but I did figure out what was corrupting my SD card, it was the updating of the Raspi firmware as specified on this site backup dd flash-memory share|improve this question edited Oct 21 '13 at 22:34 asked Oct 19 '13 at 19:28 puk 6,1091165127 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote It is possible that your raspi simply does not hit badblock on your SD card, and that's why it appears to work fine. You can dd image and ignore bad blocks by adding conv=noerror parameter. This will replace bad blocks with zeros, and if you dd that image back to another same-size card, it should work the same. share|improve this answer answered Oct 19 '13 at 19:34 mvp 47.8k85391 1 I already tried that and it still does not work. It gives more or less the same error, but many more times –puk Oct 19 '13 at 19:42 Hmm. Looks like it is time to buy new SD card. You can try to force remapping bad sectors by sudo dd if=/dev/zero of=/dev/sdb bs=1M. This may give you working card, but it probably won't last long –mvp Oct 19 '13 at 19:45 1 Thi
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