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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 (106 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.
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