Why is dd slow

Friend, that HDD seems to be in its last days Paco said ago 6 years. Does that mean they ripped me off? Reply to Paco. Slo said ago 6 years. Reply to only. Does the 3 or 5 negatives mean highly unlikely? Reply to jecale Krlos kmarillo said ago 6 years. Reply to Krlos Kmarillo. Vicente said ago 6 years. Reply to Vicente. Teck said ago 6 years. Result with Manjaro Kernel 4.

Reply to Teck. Improve this answer. Jim Salter Jim Salter 4, 1 1 gold badge 14 14 silver badges 33 33 bronze badges. If course, pv is very useful, but if you are copying a lot of data it adds more context switches and buffer copies so it will consume more CPU and perhaps may slow things down a small amount. But since copying data is rate limited on the drives it won't add much overhead.

If you do, it's almost certainly an operation so blindingly fast that there was no point in trying to add a progress bar in the first place. Very true.

I'm just and old style engineer who is just used to saving every cycle I can. For normal dd operations from one conventional hard drive to another, it won't have any impact Show 3 more comments. Well, I killed the process to figure out it was going quite slowly.. You know of any better ways to clone a hard drive the won't take all day? SeanWebber: running that command should not actually terminate the dd process.

There's an easier way to get progress output from dd now. See may answer! Show 4 more comments. You can check to see if it's already installed with: which dc3dd If not you can install it with sudo apt-get install dc3dd The command switches are similar to dd for cloning, although wiping is a bit more straightforward. I'm backing up to a Windows fileshare using smbmount. Clearly, this is not a viable backup strategy. The disk drive light on the machine being backed up flashes on and off, but spends more time off than on.

I expected dd to stream data MUCH faster than this Why is dd reading the drive contents so slowly, and how can I speed this up? Reply Quote. Thanks for the book purchase. Writing the chapter is the easy part. Coming up with a procedure that works for everybody is not. Reed and I tested a whole bunch of procedures before deciding on the ones in the chapter.

We did not test using a CIFS mount for the dd image. I just didn't give the command to do that, as the chapter was already convoluted enough. I don't see it as an errata, but it could go in the chapter updates in the Wiki. Python Javascript Linux Cheat sheet Contact. Why dd takes too long? Regarding rdsk , the sd 4 man pages say: At this time, only block devices are provided. Raw devices have not yet been implemented. In Ubuntu, you can install it with: sudo apt-get install gddrescue and just plain ddrescue to use.

Tags: Hard Disk Dd. Related Linux detects an external drive as absurdly large create empty img with dd so that it its sectors are of bytes rather than Got "input output error" when execute any commands Ubuntu recovery says "fsck from util-linux" and exits How do commands like fdisk -l find the sector size? Why is ddrescue slow when it could be faster on error free areas?