Specifications
ATAPI For Streaming Tape QIC-157 Rev B
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4.1.7. ATAPI Identify Device
The ATAPI IDENTIFY DEVICE command enables the Host to receive parameter information from
the Device. The parameter words in the buffer have the arrangement and meaning defined in the
table below. All reserved bits or words shall be zero. Although many of the fields of information
returned by the ATAPI Identify Device command are inappropriate for a Device, the fields that
shall be returned with meaningful information are shown in Table 4-1 Identify Device, Fields
Supported by Streaming Tape.
Like all ATAPI commands (A0h, A1h and 08h), this command can be issued regardless of the state
of the DRDY.
Table 4-1 Identify Device, Fields Supported by Streaming Tape
Word Description Used
0 General Configuration Mandatory
1 Cylinders No
2 Reserved No
3 Heads No
4 Number of unformatted bytes per track No
5 Number of unformatted bytes per sector No
6 Number of sectors per track No
7-9 Reserved No
10-19 Serial Number Optional
20 Buffer Type Optional
21 Buffer Size Optional
22 ECC bytes available No
23-26 Firmware revision Mandatory
27-46 Model Number Mandatory
47 Multiple Sector Command, Sector Count No
48 Double Word I/O (shall be 00h for Streaming Tape) No
49 Capabilities:
LBA bit shall be supported; DMA, IORDY bits are optional.
Mandatory
50 Reserved No
51 PIO Cycle Timing Mandatory
52 DMA Cycle Timing Mandatory
53 Validity of words 54-58 and 64-70 in this table Mandatory
54 - 56 Current Cylinder/Heads/Sectors No
57-58 Current Capacity No
59 Reserved No
60-61 User Addressable Sectors No
62 Singleword DMA mode Mandatory
63 Multiword DMA mode Mandatory
64 Enhanced PIO mode Mandatory
65 Blind PIO minimum cycle time Mandatory
66 Recommended Multi Word DMA Transfer Cycle Time Optional
67 Minimum PIO Transfer Cycle Time without Flow Control Optional
68 Minimum PIO Transfer Cycle Time with IORDY Flow Control Optional
69 - 70 Reserved (for advanced PIO support) No
71 - 127 Reserved No
128 - 159 Vendor Unique No
160 - 255 Reserved No
“Optional” Identify Device words, which are not supported, shall be set to zero.