Re: External storage recommendations?

Mr Guest <tom@xxxxxxxxxxxxxxxxxxxx> wrote:

Pd wrote (apparently) in uk.comp.sys.mac on Thu 04 Jun 2009
10:57:02:

David Empson <dempson@xxxxxxxxxxxxx> wrote:

The position on the disk makes a big difference: it is fastest
near the outer edge (e.g. copying files to an almost empty
disk), slowest in the middle (e.g. copying files to an almost
full disk).

Is that the case for all drives? I notice CDs/DVDs fill up from
the centre outwards.

Ah, that would be because there used to be 80mm and 120mm CDs, so the
TOC/table of contents needed to be in the centre so that laser beams
didn't miss the edge of the disc. Because the track density was
constant, the TOC told the drive how far out the outside of the disc
would be.

It's why the "business card" CDs and mis-shapen CD picture discs work.

Dunno which way HDDs do things though. Given all the sector mapping
and so on they do, it's probably difficult to tell.

Ah, yes, so how did the automatic turntables of yore
manage to put the needle in the outer groove?

Jan
.

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