Why are external HDD enclosures advertised as 3.5"

Andrew Jorgensen andrew.jorgensen at gmail.com
Tue Feb 6 10:03:09 MST 2007


On 2/6/07, Kenneth Burgener <kenneth at mail1.ttak.org> wrote:
> I was looking for a simple external HDD enclosure and I couldn't
> remember, off the top of my head, if my standard desktop hard drive was
> the 2.5" or 3.5" size.  So I pulled out the ruler, and measured the
> drive.  It is roughly 5.5" x 4" x 1".  It would seem to me that the 3.5"
> size is what I am looking for, but the drive is not 3.5" wide.  Why?

3.5" is the size of the floppy disk that goes in a "3.5"" (use of
quotes intentional) floppy drive, which is roughly the same width as
your HDD.  Likewise 5.25" refers to the floppy disks that went in
drives with that nominal size.



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