problems with Hitachi 1TB SATA drives
olli at lurza.secnetix.de
Wed Jul 25 08:15:08 UTC 2007
Jeremy Chadwick wrote:
> * Hard disks are growing in capacity, but are not growing in physical
> size. We're pushing 1TB in a 3.5" form factor. And the same applies to
> laptop (2.5") drives. The margin of error continues to increase as we
> try to cram more and more data in such a small medium. I personally
> would *love* to see drives go back to using a 5.25" form factor,
> especially for large capacity disks, since chances are it means higher
> reliability (read: less chance of error).
As far as reliability goes, I agree.
However, the problem is, you cannot make 5.25" disks spin
at 10 or 15 krpm. Well, maybe you can, but it's a hell of
an engineering problem. Even 7200 rpm isn't trivial to do
for such large discs. And who wants to buy a slow 3600 rpm
5.25" drive? Apart from that, the larger radius also means
slower end-to-end movement for the heads.
> * All this leads me to the topic of backups. Hard disks are growing in
> capacity at a rate which the backup industry cannot follow. It's
> getting to the point where you have to buy hard drives to back up the
> data on other hard drives, but anyone with half a brain knows RAID is
> not a replacement for backups.
Correct, RAID and backups are completely different. But
you can use disk drives for both.
I solved my backup problem by putting a hot-swap ATA frame
into my home server (they're pretty cheap nowadays), and
using a bunch of ATA disks as removable media. It's just
like tape backups, but much cheaper, faster and easier to
use. It beats every tape technology hands down.
> going to sit around once a week backing up a terabyte of data to ~120
> dual-layer 8.5GB DVDs?
I wouldn't even start thinking about considering that.
> The closest thing out there right now is
> a product from IOMega called REV, which (at most) offers 70GB of storage
> per disk, or 140GB with compression.
> A new IOMega REV (which includes one 70GB disk) costs US$600 MSRP. You
> read that right.
Ugh. For US$600 you get four 400 GB disk drives, including
four trays and one frame (hot-swap capable). That's 1.6 TB
of backup capacity. Compare that to 70 GB. I also guess
that that "REV" thing is much slower than an ATA disk.
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M.
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