How sensitive are today's HDs to vibration and movement? Should a
desktop not be moved at all while the HDs are in operation? Are laptop
HDs less susceptible? Thx.
Previously sillyputty <karmictaragem@2die4.com> wrote:
> How sensitive are today's HDs to vibration and movement? Should a
> desktop not be moved at all while the HDs are in operation? Are laptop
> HDs less susceptible? Thx.
For catastrophic failures (headcrash), the bar hsa been way
raised in newer disks. However, drop it on a hard surface while
running and you will still likely loose it. And, yes, Laptop hdds
can take more abuse. It is a bit hard to say, but may guess
would be that it start to beceome life-threatening from 10cm
fall height on or so for laptop disks mounted in a laptop.
As to vibration, it can cause defective sectors. If the pile up,
at some time the disk will be out of spares and will effectively
be broken. Data loss can occure before that.
Operating Shock (max) 63 Gs at 2 msec
Nonoperating Shock (max) 350 Gs at 2 msec
Vibration
Operating vibration 0.25 Gs at 5-22 Hz
Operating vibration 0.50 Gs at 22-350 Hz
Operating vibration 0.25 Gs at 350-500 Hz
Nonoperating vibration 0.25 Gs at 5-22 Hz
Nonoperating vibration 5.0 Gs at 22-350 Hz
Nonoperating vibration 1.0 Gs at 350-500 Hz
>Should a
>desktop not be moved at all while the HDs are in operation?
IMO that's the way to go. Twenty years ago I used to service mainframe
hard drives. I saw many head crashes and replaced and aligned hundreds
of disc heads. In those days Seagate used to say that hard disc
technology was akin to a jumbo jet flying at supersonic speed one
metre above the ground and counting the blades of grass as it passed.
Nowadays the flying height would be much lower, the speed much
greater, and the grass much thicker. Also in those days the heads did
not park on the disc surface but were retracted at spin-down.
I'm sure today's disc technology is infinitely more reliable than in
those days, although it was quite good back then, too. That said, I'd
still play it safe. Even if head-to-disc contact is not severe enough
to cause a catastrophic crash (I've seen shiny "divots" in working
Corvus discs), the leading edge of the head pad may accumulate oxide
which can eventually precipitate more serious problems. In fact part
of the recommended maintenance for old removable pack disc drives was
to polish the heads with isopropyl alcohol.
how sensitive are HDs to vibration? 
Linear Mode
