Descriptor blocks
The header is followed by one or more Report Density Support descriptor blocks with the following format:
|
| 7 | 6 | 5 |
| 4 | 3 | 2 | 1 | 0 |
|
|
|
|
|
|
|
|
|
|
|
| 0 |
|
|
|
| Primary Density Code |
|
|
| |
|
|
|
|
|
|
|
| |||
| 1 |
|
|
| Secondary Density Code |
|
| |||
|
|
|
|
|
|
|
|
|
|
|
| 2 | WRTOK | DUP (0) | DEFLT |
|
|
| Reserved (0) |
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 |
|
|
|
| Reserved (0) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 4 |
|
|
|
| Reserved (0) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 5 | (MSB) |
|
|
| Bits per mm |
|
|
| |
|
|
|
|
|
|
|
|
| ||
| 7 |
|
|
|
|
|
| (LSB) | ||
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| 8 | (MSB) |
|
|
| Media Width |
|
|
| |
|
|
|
|
|
|
|
|
| ||
| 9 |
|
|
|
|
|
| (LSB) | ||
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| 10 | (MSB) |
|
|
| Tracks |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
| 11 |
|
|
|
|
|
|
| (LSB) | |
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| 12 | (MSB) |
|
|
| Capacity (MB) |
|
|
| |
|
|
|
|
|
|
|
|
| ||
| 15 |
|
|
|
|
|
| (LSB) | ||
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| 16 | (MSB) |
| Assigning Organization |
|
| ||||
|
|
|
|
|
| |||||
| 23 |
|
|
| (LSB) | |||||
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| 24 | (MSB) |
|
|
| Density Name |
|
|
| |
|
|
|
|
|
|
|
|
| ||
| 31 |
|
|
|
|
|
| (LSB) | ||
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| 32 | (MSB) |
|
|
| Description |
|
|
| |
|
|
|
|
|
|
|
|
| ||
| 51 |
|
|
|
|
|
| (LSB) | ||
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
The values reported for Ultrium 3 format tapes are as follows:
Primary Density Code | 44h | This is reported via the Mode Sense command. |
|
|
|
Secondary Density Code | 44h | Not used |
|
| |
WRTOK | The Write OK flag indicates whether the drive can write at the density | |
| indicated by the Density Code. | |
| 0 | The drive does not support writing to a tape with this density. |
| 1 | The drive is capable of writing at this density to the current |
|
| tape (if the Media bit in the CDB = 1) or for some tape (if |
|
| Media = 0). |
|
| |
DUP | The Duplicate flag will be set to zero for every descriptor block indicating that | |
| each density is only reported once. | |
|
| |
DEFLT | The Default flag will be set for the density for which the currently mounted | |
| medium is formatted and clear for all other densities. | |
|
|
|
Bits per mm | 4880 |
|
|
|
|
138 Commands