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Creating RAW imgaes

Posted: Sat Dec 10, 2016 12:33 am
by alex4478
Hi,

Would a spanned volume in OSX work just as well for creating an image of the problem drive as a RAID0?

My problem drive is 3TB, my two spare disks are 2TB and 1.5TB (3.5TB).

I have been advised by support to create a RAW image using diskutility or ddutility.

Many thanks for any replies and help, I have emailed support but figured they may not work weekends.

Re: Creating RAW imgaes

Posted: Sat Dec 10, 2016 1:35 am
by Corsari
Sure

One disk image is just a file which size is equal than the size of the drive you clone.

So you need a partition/volume of a size large enough to contain such file, no matter how that volume rely on.

BUT BEWARE cloning drives...

Read my hints and tips on this argument. Check out my signature at bottom of this post

Unless you don't care too much about your data.

Re: Creating RAW imgaes

Posted: Sat Dec 10, 2016 5:12 am
by alex4478
Thanks for the reply.

Is ddutility thorough enough to copy absolutely everything?

Re: Creating RAW imgaes

Posted: Sat Dec 10, 2016 6:16 am
by Corsari
If the drive is healthy, yes.

Have you checked SMART values of the drive?

Read my guides

Links are in the signature at bottom

Re: Creating RAW imgaes

Posted: Sat Dec 10, 2016 6:36 am
by alex4478
The SMART values are the wrong end but low enough to make the all the status GREEN.

Re: Creating RAW imgaes

Posted: Sat Dec 10, 2016 1:19 pm
by alex4478
Well I knew it wouldn't be easy, I had started the copy and then got this error message

(com.apple.diskutility error 3.)

And after I got a "status 5" message.

Any ideas what happened there?

I did it within the disk utility.

Would doing from the startup/OS X recovery disk make any difference?