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HP 88781A 9-Track Tape Drive

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HP 88781A 9-Track Tape Drive
SKU: 134-01-11240

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48VDC Vertical 9-Track for Telcos

HP 88781A Streaming 9-Track Tape Drive

The HP 88781A is a vertically mounted, 1/2-inch reel-to-reel tape drive. Designed for performance and simplicity, the 88781A features the latest in storage technologies:


Extended Warranty for Tape Drives

Our Extended Service eliminates hourly repair bills and puts you at the front of the line for tape drive repair. We repair many brands and formats of tape drives:

  • HP 88780/7980- based 9-track tape drives, including Tandem 5170, Tandem 5175, IBM 9348, Sun, Scitex, Sequent, AT&T, NCR;
  • 18-track, 36-track, 128-track, 256-track and 384-track SCSI by Xcerta, Fujitsu, Tandem, IBM, Sequent, Qualstar, Overland Data, JVC, MP Tapes, VDS. (Formats: 3480, 3490, 3490e, 3590, 3590e, 3590h.)
  • Don't wait till trouble finds you. Call 800-432-8638/563-355-1212 today.

    • Compact, ergonomic design
    • Simplified control panel
    • Versatile handling of all standard-sized reels (6 to 10 1/2 inches)
    • 125 ips nominal tape speed for maximum streaming performance
    • Supports both 1600 cpi Phase Encoded (PE) and 6250 cpi Group-Coded Recording (GCR)
    • 1-Mbyte cache buffer for fast transfers during start-stop applications
    • Easy-to-use diagnostics
    • Custom operating features, selected by the operator from the control panel
    • Low power consumption

    Designed for Shallow Racks

    Designed for use in telephone companies, the HP 88781A accommodates the "shallow-rack" requirements unique to this industry.

    The HP 88781A is fitted with a 48VDC power supply for use in telephone switching centers. The 88781A complies with applicable Bellcore standards to make this the ultimate in reliable data collection equipment.

    Available variations of the 88781: 88781a, 88781aa.


    Formatted Data Capacity:
    (2400 ft. tape)
    200-700 Mbytes (typ. 6250 cpi)
    140 Mbytes (typ. 6250 cpi)
    40 Mbytes (typ. 1600 cpi)

    Tape Speed

    Transfer Rate To/From Tape (max): 769 Kbytes/s (6250 GCR);
    208 Kbytes/s (1600 PE)
    Read/Write: 123 ips (GCR)
    130 ips (PE)
    Rewind: 320 ips avg., 450 ips max.
    90 sec. to rewind 2400 ft.


    Standard:6250 cpi GCR
    1600 cpi PE

    Maximum Physical Block Size On Tape*

    6250 GCR:256 Kbytes
    1600 PE:64 Kbytes
    *block size may be limited by host operating system.

    Power Requirements

    DC Input Voltage: 48-60V DC
    Power Consumption: 250 W max.
    20 W standby
    170 W idle


    Height: 609 mm. (24 in.)
    Width: Front panel: 482.6 mm. (19 in.)
    Depth: Overall: 313.35 mm. (12.34 in.);
    Within Rack: 225.35 mm. (8.87 in.)
    Rotation Distance: 304.8 mm. (12 in.)
    Weight: 37 kg. (81 lbs.)


    Hard Error Rate:
    GCR Read: 1 in 10^11 at 90% statistical confidence
    Write: 1 in 10^10
    PE Read: 1 in 10^10 at 90% statistical confidence
    Write: 1 in 10E9

    Functional Characteristics

    Internal Buffer Size: 512 Kbytes
    Operating Mode: Streaming
    Interfaces: SCSI (single-ended & differential); Pertec-compatible

    Environmental Conditions

    Operating Temperature: 15° to 32° C, non-condensing (range limited by media)
    Rate Of Change: 20° C/hr.
    Relative Humidity: Operating: 20 to 80% at <25° C max. wet bulb temp.
    Storage or shipment: 90% at 40° C
    Altitude: Operating: 3000 m. (10,000 ft)
    Non-operating: 15,300 m. (50,000 ft)


    Operating, Random: 5-500 Hz. approx. 0.25 G RMS
    Non-operating, Random: 5-500 Hz. approx. 2 G RMS
    Non-operating, Swept Sine: 5-500-5 Hz., 0.5 G RMS (0-peak)

    Audible Noise

    Read/write Operations:
    (A-weighted sound power)
    6.6 Bels A
    Tape-loading Operation:
    (A-weighted sound power)
    7.2 Bels A

    * Faliure rates are derived from a large data base of test samples. The actual faliure rate will vary from unit to unit. Not responsible for typographical errors.

    ** GCRXC is a Hewlett Packard data compression protocol implemented almost exclusively in non-PC HP computer systems.

    Available variations of the 88781: 88781a, 88781aa.

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