Specifications

ATAPI For Streaming Tape QIC-157 Rev B
26
Bits 1-0 Command
Packet Size
This field indicates the size of the command packets used by this
Device.
00b = 12 bytes (ALL Streaming Tape)
01b = 16 bytes (Reserved for future Devices)
1Xb = Reserved for future use.
4.1.7.2. Serial Number (Words 10 - 19)
This optional field shall contain the Device’s serial number formatted as right-justified ASCII,
padded with spaces (20h). If the field is not supported then it shall be filled with spaces.
4.1.7.3. Buffer Type (Word 20)
The contents of the field are determined by the type of Device. These codes are not typically used
by ATAPI Devices, however, for ATAPI Streaming Tape Devices, this field is defined the same as
byte 6 and 7 of Capabilities and Mechanical Status Page where byte 6 is bits 15-8 and byte 7 is bits
7-0.
4.1.7.4. Buffer Size (Word 21)
The contents of this field indicate the size of the buffer used for Host transfers and caching by the
Device. For the ATAPI Streaming Tape Device this field, multiplied by 512 bytes, defines the size
of the write buffer.
4.1.7.5. Firmware Revision (Words 23-26)
The contents of this field are vendor-specific, left-justified, and padded with spaces.
4.1.7.6. Model Number (Words 27 - 46)
The contents of this field are vendor-specific, left-justified, and padded with spaces.
4.1.7.7. Capabilities Word (Word 49)
Table 4-3 Identify Device Data - Capabilities Word (49)
Bit
Byte
7/15 6/14 5/13 4/12 3/11 2/10 1/9 0/8
0 Vendor Unique
1 Reserved Reserved for
Future
ATAPI
Standard
Reserved for
Future
ATAPI
Standard
Reserved for
Pseudo
DMA
Support
IORDY
Supported
IORDY can
be disabled
LBA
Supported
DMA
Supported
Bit 8 DMA
Supported
This bit indicates that the Device supports the DMA mode of data
transfer.
Bit 9 LBA
Supported
Indicates that the Device supports the LBA form of addressing. The
ATAPI Devices shall set this bit to one.