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For tape,the common commands would be:
For DATA commands:
the amount of data you actually get from the drive
may be FEWER than requested if you encounter an error:
medium error, filemark, EOD, physical end of medium,
etc.
<ALWAYS> look at the 'residual count' in the REQUEST SENSE response.
READ(6), WRITE(6)
For ANY non-DATA commands:
You can always get FEWER bytes than requested from these
commands if the device does not have the 'allocated' bytes
available or valid for the particular command:
This is normal, and is NOT an error.
INQUIRY, REQUEST SENSE, MODE SENSE, LOG SENSE
READ POSITION, READ BUFFER, WRITE BUFFER, etc.
- Jim Hatfield
Sr. Firmware Engineer
Overland Data Inc.
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Subject: [t13] ATAPI DMA Byte Count usage for Data commands
Question:
Are there any ATAPI Data commands (PLEASE note DATA (Read 10 etc)), where
the data length
is not the same as the requested length ?
For non-data commands, I know of
Request Sense
Mode Sense
Are there other common ones for CD/RW/DVD and Tape ?
Jeff
Jeff Wolford Email: [EMAIL PROTECTED]
Senior Storage Architect
Storage Interface and Tools - PC Storage Group
Voice: (281) 514-9465, Pager: (800) 973-5739
Compaq Computer Corporation
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