backup hard disk with dd- time estimates
Hi,
i am dd'ing data -offline- from an 80GB internal hard disk to a USB-external hard disk of exactly the same type. The process has been running now for about 3 hours. I once remember dd'ing data to a 256MB compact-flash, which took me about 10 minutes. If the relation of data and time is analogous, i could be copying for a couple of days! Can somebody share his experience? I haven't found anything useful in the net so far... Thanks |
I've used dd for partitions in the 60Gb range. The 60GB takes about 90 minutes going from an internal IDE hard drive to a USB external hard drive. How much RAM do you have? I have 1 GB. See if your computer is using a lot of swap space. If it is then you might improve performance by increasing the swap space available or adding RAM.
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As mentioned above, it all hinges on the available horse power (ram, ram type, cpu clock speed, etc.) Three hours is not unrealistic for many mainstream systems.
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I'd be more concerned with *which* USB protocol you are using - better hope it's USB2.
Doesn't sound like it though - 256Meg in 10 mins sounds like a (bad) USB1.1 transfer. And I think "a couple of days" estimate is a bit on the low side if true. |
Time estimated of dd'ing
Quote:
---------- Post added 12-13-11 at 01:11 PM ---------- Quote:
I know this post it's very old, but i wanna help. To estimate dd'ing data, i made the following: execute de dd command for 5 seconds and cancell it. Now you should get the time per seconds, and in base of that you can calculate without problems So, I have 28G of harddrive, and the time after execute the command was 3.6 M/s And I have 28*1024 = 28672 MB 28672 MB -------- = 7964,444444 seconds = 132,7407407 Minutes = 2,212345679 hours. 3.6 MB/s hope it helps. |
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