TITLE
    AppleCD 1200i CD-ROM Drive: Specifications (9/96)
Article ID:
Created:
Modified: 		20210
7/25/96
11/15/96
TOPIC


    This article contains the specifications for the AppleCD 1200i, an internal
    8x-speed CD-ROM drive included with some Macintosh computers.

DISCUSSION



    Disc diameter
    =============
    120 millimeters (5.25 inches) and 80 mm

    Scanning velocity
    =================
    1.2-1.4 meters per second (normal speed)


    Rotation speed (varies over radius)
    ==============
    Normal speed
    ------------
    approximately 530 to 230 rpm

    Double speed
    ------------
    approximately 1060 to 460 rpm

    Eight-times speed
    -----------------
    approximately 4240 to 1840 rpm


    Latency (average) (varies over radius)
    ======================================
    Normal speed
    ------------
    approximately 55 to 130 milliseconds (ms)

    Double speed
    ------------
    approximately 27.5 to 65 ms

    Eight-times speed
    -----------------
    approximately 6.88 to 16.25 ms


    Blocks per rotation
    ==================
    approximately 8.4 to 19.5 variable


    Average access time (typical)
    ===================
    Normal speed
    ------------
    380 ms

    Double speed
    ------------
    270 ms

    Eight-times speed
    -----------------
    160 ms


    Data
    ====
    Data capacity
    -------------
    * 656 MB, Mode 1
    * 748 MB, Mode 2

    Number of blocks per disc
    -------------------------
    336,150

    Data per block
    --------------
    * 2048 bytes, Mode 1
    * 2336 bytes, Mode 2

    Address description
    -------------------
    Minutes, seconds, blocks


    Audio capacity
    ==============
    Playing time
    ------------
    74 minutes, 42 seconds

    Modes supported
    ===============
    Audio CD
    --------

    CD-ROM
    ------
    Modes 1 and 2

    CD-ROM XA
    ---------
    Mode 2, Forms 1 and 2

    CD-I
    ----
    Mode 2, Forms 1 and 2

    Photo CD
    --------
    Single session and multisession

    Video CD
    --------


    Data streaming and transfer rates
    =================================

    Blocks per second
    -----------------
    * Normal speed 75
    * Double speed 150
    * Eight-times speed 600

    User kilobytes (K) per second
    -----------------------------
    * Normal speed
    - 150K, Mode 1
    - 171.1K, Mode 2
    * Double speed
    - 300K, Mode 1
    - 342.2K, Mode 2
    * Eight-times speed
    - 1200K, Mode 1
    - 1368.8K, Mode 2

    SCSI bus burst rate (typical)
    -------------------
    * Asynchronous: 5.0 MB per second
    * Synchronous: 5.0 MB per second


    Power consumption (typical)
    =================
    * +5 V DC: 350 milliamperes (mA)
    * +12 V DC: 300 mA

    Laser
    =====
    Type
    ----
    Semiconductor GaAlAs laser

    Wavelength
    ----------
    770 to 795 nanometers

    Output power
    ------------
    0.2 to 0.6 milliwatts

    Beam divergence
    ---------------
    55 deg.


    Article Change History:
    20 Sep 1996 - Added product name and keyword.
    02 Aug 1996 - Changed distribution status.



Document Information
Product Area: Peripherals
Category: CD-ROM
Sub Category: AppleCD 1200 and AppleCD1200i

Copyright © 2000 Apple Computer, Inc. All rights reserved.