[inforoots] Unknown Device: Disk Actuator

[Hans Neukom]

Thanks to everybody for your answers. All answers agree that it must be a
disk actuator. Equipped with this knowledge, I will look again at the device
on my next visit to this collection, maybe I get permission to handle it
myself and investigate it at close distance. It might take some time for me,
but I will post my results again to Inforoots.

Hans Neukom

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  -----Original Message-----
  From: inforoots-bounces at computerhistory.org
[mailto:inforoots-bounces at computerhistory.org]On Behalf Of Peter Capek
  Sent: Dienstag, 28. Februar 2006 23:08
  To: Open Discussion about the history of the Information Age
  Subject: Re: [inforoots] Re: inforoots Digest, Vol 25, Issue 14


  It's certainly a disk actuator.   The 2 white disks (which look to be
about an inch in diameter, but with a slice taken off each side) visible in
the ..1939.. photo look
  like the read/write heads, so apparently two per disk, moving on one
access arm.

  Just judging from the scale of this and estimating the size, I would guess
this assembly is
  from a large disk - perhaps 24 inches, maybe more, in diameter (and hence,
likely, no newer than about 1970).

  The arms appear to be numbered up to 10 in the 1940 photo, so there were
probably 20 surfaces used in the drive.

                  Peter Capek


  On 2/28/06, Curtis A. Jones <curtis_jones at prodigy.net> wrote:
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    =======================================
    It looks like an actuator for a disk drive with about
    11 disks.  At least I counted about 11 head-arm
    assemblies.  But I don't recognize it, and am not even
    certain it's an actuator.

    The large shiny pieces on the top and maybe bottom
    might serve as shields and as clamps to hold what
    might be a large sort of cylindrical ferrite magnet
    assembly (shiny black) that I imagine I can see
    peeking out the side of picture in which "REV F" is
    visible.  On the other picture I imagine I see small
    bearings/wheels on a track below and to the left of
    the plate to which the head-arm assemblies must be
    fastened.
    Curtis


    > Message: 1
    > Date: Tue, 28 Feb 2006 17:17:10 +0100
    > From: "Hans Neukom" <hans.neukom at hispeed.ch>
    > Subject: [inforoots] Unknown IT Device from a
    > collection in
    >       Switzerland
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