ATAPI Interface
Chapter 5
STT20000A Product Manual
Page 61
Test Unit Ready command
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation code (00h)
1
Reserved
2
Reserved
3
Reserved
4
Reserved
5
Reserved
This command can be used to determine the readiness of the device to accept a
media access command. It’s purpose is to indicate the cartridge state: no cartridge
(or drive fault), cartridge becoming ready, or cartridge/drive ready.
If the drive is busy with a previous command (DSC reset), the drive will wait for the
previous operation to complete before releasing the ATA bus. On some other ATAPI
tape drives, Test Unit Ready does not wait for DSC set before completing, and if an
application needs to “wait” for an command done via the ATAPI interface, Read
Position should be used instead.
Summary of Contents for STT20000A
Page 1: ...STT20000A ATAPI Minicartridge Drive Product Manual...
Page 22: ...Chapter 2 Specifications Page 14 STT20000A Product Manual Notes...
Page 30: ...Chapter 3 Installation Page 22 STT20000A Product Manual Notes...
Page 38: ...Chapter 4 Drive operation and maintenance Page 30 STT20000A Product Manual Notes...
Page 78: ...Chapter 6 Tape Format Page 70 STT20000A Product Manual Notes...
