Viper 60s Theory Of Operation And Maintenance Manual page 54

INTERFACE
The Viper drive calculates the Residual Length for write functions the same way in
Buffered Mode as in Non-buffered Mode. Residual Length is calculated by:
RC
=
AL - (TL - RL)
Where:
RC (Residual Count)::::: The amount of data trapped in the Viper
drive buffer, not written to tape. This is
the same quantity as RL.
AL (Actual Length)
=
Blocks transferred from the host to the
Viper drive across the SCSI bus.
TL (Transfer Length) = The Transfer Length from bytes 2-4 of
the Write Command (RequestTransfer
Length).
RL (Residual Length)::::: The Residual Length from bytes 3-6 of
the Request Sense Extended Sense. (The
amount of blocks not written to tape.)
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