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AM-64x DAT High Capacity Tape Drives
PDI-00649-00, A01
AM-647 (Archive) DAT Drive Characteristics
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Two models: a 3.5” half-height drive, and a 5.25” half-height drive.
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Both drives have the same operational characteristics.
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Has a data capacity of approximately 2 gigabytes using 90 meter tapes
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Can be used on a SASI or SCSI-2 bus, including Wide SCSI-2 with an appropriate adapter
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CANNOT read/write compressed data tapes
AM-648 (Exabyte) DAT Drive Characteristics
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Has a data capacity of approximately 2 gigabytes in standard DDS (non-compressed) mode, and
approximately 4 gigabytes in DDS-DC compressed mode with a 90 meter tape
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Can be used on a SCSI-2 bus only, including Wide SCSI-2 with an appropriate adapter
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Can be forced into compressed or non-compressed mode using the AMOS TMODE command
AM-649 (HP) DAT Drive Characteristics
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There are two models of the AM-649 DAT drive:
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The AM-649-00 4 gigabyte drive (HP model C1536A) has a data capacity of
approximately 2 gigabytes in DDS (non-compressed) mode, and approximately 4
gigabytes in DDS-DC compressed mode with a 90 meter tape.
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The AM-649-01 8-gigabyte drive (HP model C1533A or C1599A) has the same data
capacities as the AM-649-00 using DDS/DDS-1 tape, with additional DDS-2 capabilities
yielding approximately 4 gigabytes of storage in native DDS-2 mode and 8-gigabytes in
DDS-2-DC compressed mode, when used with 120 meter DDS-2 tapes. In DDS-2 mode,
file access and data transfer rates are significantly faster than DDS/DDS-1 modes.
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Can be used on a SCSI-2 bus only, including Wide SCSI-2 with an appropriate adapter
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Can be forced into compressed or non-compressed mode using the AMOS TMODE command
See the "DAT Drive Compatibility" section of this manual and the TMODE reference sheet in
the Alpha Micro System Commands Reference Manual for more details on switching between
compressed and non-compressed data modes.
Drive Mounting Kits
In addition to the DAT tape drive, some installations require a drive mounting kit. Each mounting kit
includes the hardware to install a DAT drive in a particular type of computer. The following chart shows
the mounting kits needed for different Alpha Micro computers:
