How are 1.8" and 2.5" hard drives measured?

Discussion in 'Mac Basics and Help' started by kumbaya, Apr 10, 2008.

  1. kumbaya macrumors regular

    Joined:
    Jan 12, 2005
    #1
    Wikipedia article on hard drives:

    "2½ inch" drive: (2.75 in x 0.374 in x 3.945 in = 69.85 mm x 9.5 mm x 100 mm)

    "1.8 inch" drive: (54 mm × 8 mm × 71 mm)

    I can't see how the 2.5" and 1.8" descriptions are derived..

    What do the 2.5" and 1.8" refer to??

    ...driving me mad...

    :):apple:

    Ooops, saw this just now in the same article:

    The inch-based nickname of all these form factors usually do not indicate any actual product dimension (which are for more recent form factors specified in millimeters), but just roughly indicate a size relative to disk diameters, in the interest of historic continuity.

    Hate that companies can just make up stuff when we think it's smaller than it is, but when it's TVs and monitors they tell us that's 60" when it's the diagonal measurement!!!!

    Corporate pathology
     
  2. flopticalcube macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #2
    Platter diameter.

    http://www.pcguide.com/ref/hdd/op/mediaSize-c.html

    Lots of popups on that site so I will quote the salient info:

     
  3. kumbaya thread starter macrumors regular

    Joined:
    Jan 12, 2005

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