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Old 01-28-2011, 03:42 PM
Ronin Ronin is offline
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Join Date: Nov 2005
Posts: 23
SD backup while disk is in use

I needed to clone a 1.5 TB data drive with roughly 900 GB on it to a 2 TB drive, but needed to use it as the transfer was going quite slowly (started at around 30 MiB/s but dropped to 10).

Obviously, anything that was changed after it was copied would not be up-to-date, but it appears that the operation continued to completion. Thereafter I did a smart update to bring things up-to-date when I went out for a bit and am presently running off of the 2 TB drive without apparent difficulty.

A couple of questions came to mind about this.

This first is, why was a straight erase and copy running so slowly? (I have an external 2 bay SATA enclosure that the drives were in which runs off of a PCI/SATA controller in a FW 800 G4 (dual 1.42 GHz) with OS 10.5.8.

Any thoughts about whether there are drawback to doing things this way?

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