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SCSI Commands

5-184 Quantum DLT 8000 Tape System

REPORT DENSITY SUPPORT Command (44h) (continued)

Table 5-84 Density Support Data Block Descriptor — Field Descriptions (continued)

Data Field Description

Bit Per MM Bits per millimeter. The value in this field indicates the number of bits per

millimeter per track as recorded on the tape medium. Note that the value is

rounded up if the fractional value of the actual value is greater than or equal

to 0.5. A value of 00h indicates that the number of bits per millimeter does

not apply to this logical unit.

Media Width The value in this field indicates the width of the tape medium supported by

this density. This field has units in tenths of millimeters.

Tracks The value in this field indicates the number of data tracks supported on the

medium by this density.

Capacity If the Media bit = 0, the Capacity field indicates the approximate capacity

of the longest supported medium. If the Media bit = 1, the Capacity field

indicates the approximate capacity of the current medium. The capacity

assumes that compression is disabled. If this density does not support an

uncompressed format, the capacity assumes that compression is enabled

using “average” data. The capacity also assumes that the media is in good

condition and that normal data and block sizes are used. The value is given

in units of megabytes (10

bytes). Note that the logical unit does not

guarantee that this space is actually available in all cases.

The Capacity field is intended to be used by the client to determine that the

correct density is being used, especially when a lower density format is

required for interchangeability.

Assigning

Organization

This field contains 8 bytes of ASCII data identifying the organization

responsible for the specifications that define the values in the density

support data block.

Density Name This field contains 8 bytes of ASCII data identifying the document that is

associated with this density support data block.

Description This field contains 20 bytes of ASCII data describing the density.

1 2 ... 323 324 325 326 327 328 329 330 331 332 333 ... 407 408

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