Re: external hard-disk enclosure advice?
On Sat, Aug 26, 2006 at 01:44:29PM +0900, Miles Bader wrote:
> firstname.lastname@example.org (J.A. de Vries) writes:
> > I recently bought such a beast for backup purposes. I choose an Icy Box
> > IB-360-BL. This is an external closure for 3.5" IDE/SATA disks and
> > features both USB and Firewire interfaces. The disk itself I had to buy
> > separately, but that was exactly what I wanted.
> Hi, thanks for the review. How's the I/O speed / CPU usage (I heard USB
> can eat a lot of CPU at high speeds)?
I use a couple of disks in external USB caddies to carry around a Debian
mirror or two :) I'm currently using caddies from Iomega which
originally had 160GB disks in - I think the latest caddies from them now have 300 /
320GB disks as standard.
These are strong aluminium caddies with a steel tray inside and rubber
washers providing some shock absorption round the drive fixing screws,
the end fixes with two small flat head screws and the caddies have a
robust power supply.
I've previously borrowed a caddy that would spin a largish disk but not
read from it because there wasn't enough power reserve given by the power
adaptor block. Cheap caddies really feel cheap and flimsy: try and look
at the quality before you buy.
Watch out for heat dissipation if the drives are on full time: I've run
disks for 6 hours + and the caddies get quite warm to the touch on the
outside - the disks themselves are hot to the touch if you take them
from the case.
I tend to use rsync to copy gigabytes of data across to these. I have
been noticing md5sum errors in the copied Debian archives: I _think_
this is because even after you umount the external disk, you tend to
switch it off when it's still spinning at full speed :(
> I was thinking to make this disk my "main" disk, not a backup disk, so
> I'm more concerned with that than most people probably are.
You may want to reconsider that and use the disk primarily as backup and
portable storage. Some motherboards won't boot readily from a USB
attached hard disk.
> [Is there such a thing as an external SATA disk? That should be much
> faster I guess, but I'm not sure offhand if disk speeds justify worrying
> about interface speed this much ... :-]
There are - but I haven't seen many yet.
300GB transfers fairly fast over USB 2.0 - in about 10 hours :) 480
MBit/s = 48MBytes transferred per second or so - and real life suggests
that it feels fast :)_
> "Unless there are slaves to do the ugly, horrible, uninteresting work, culture
> and contemplation become almost impossible. Human slavery is wrong, insecure,
> and demoralizing. On mechanical slavery, on the slavery of the machine, the
> future of the world depends." -Oscar Wilde, "The Soul of Man Under Socialism"
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