Davey Brain wrote:

> Andrew Belov wrote:

> > On Sun, 19 Jun 2005 22:49:41 -0700 (PDT), Franklin wrote:

> >>Hey, my 40 gig Hitachi 2.5 HD is 2.75" wide. As is the 20
gig IBM it
> >>replaced. I would not recommend insulating the heat in by filling the
> >>space with TP. I think as long as the hard drive is fastened tightly to
> >>the caddy it will be just fine with the air space around it.

> > No 2.5" HDD in universe is 2.5" wide. It's a "form
factor" that
> > originally applied to floppies, and the physical dimensions of units are
> > always larger:

> > 2.5" = 2.75" wide
> > 3.5" = 4" wide
> > 5.25" = 5.75" wide
 
> I believe the size refers to the actual platters in the hard drive. So a
> 2.5" HD has 2.5" platters therefore the casing must be larger. Someone
> can correct me if I'm wrong.

Almost all ostensible inch sizes are nominals. The platters from my
original IBM PC AT 20M CMI drive measure exactly 5" across. More modern
'5.25"' drive platters might be 1/4" wider. ;-) The platters I have from
'3.5"' drives measure 3.75" across, ~1/4" wider than a
3.5" floppy
shell. '5.25"' drives fit in bays exactly 5.75" wide, while '3.5"'
drives measure ~4" across. The exception I'm aware of is that '5.25"'
floppy shells really are 5.25" wide, while '3.5"' is prolly close enough
to count as another exception.
-- 
"Love does not demand its own way."                1 Corinthians 13:5

 Team OS/2 ** Reg. Linux User #211409

Felix Miata  ***  http://members.ij.net/mrmazda/



 
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