1. Forum
  2. Usenet
  3. COMP.ARCH

  • Re: Where did CKD disks come from?

    From Sarr Blumson@21:1/5 to EricP on Mon Dec 23 18:40:27 2024
    EricP <ThatWouldBeTelling@thevillage.com> wrote:
    John Levine wrote:

    BTW if you want to see a weird piece of storage hardware,
    take a gander at the chapter on 2321 Data Cell Drive.
    It has a rotating drum with cards in slots that move up and down
    to be read, kind of like the old slide projectors,
    and each card has 10 magnetic stripe

    http://www.bitsavers.org/pdf/ibm/2841/

    http://www.bitsavers.org/pdf/ibm/2841/A26-5988-0_2841_2311_2321_7320_Descr.pdf

    In 1969 I was a TA for intro programming with ~300 studemts at Michigan. The Computer Center had just bought a DataCell and, because they intended it for archival storage, made it cheap. So we, being budget conscious, put the
    course files for out final problem on it. During finals week. MTBF was about
    20 minutes. Great unhappiness.

    --
    sarr@sdf.org
    SDF Public Access UNIX System - http://sdf.org

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Lars Poulsen@21:1/5 to Sarr Blumson on Mon Dec 23 21:48:11 2024
    On 2024-12-23, Sarr Blumson <sarr@sdf.org> wrote:
    In 1969 I was a TA for intro programming with ~300 studemts at Michigan. The Computer Center had just bought a DataCell and, because they intended it for archival storage, made it cheap. So we, being budget conscious, put the course files for out final problem on it. During finals week. MTBF was about 20 minutes. Great unhappiness.

    That lack of reliability is also exceptionally bad for archival storage.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)