![](/images/backgrounds/146247/146247-253153x1.png)
| Table | |
|
| |
Field | Description | |
|
| |
Mode | Four modes are supported by the drive; Combined Header and Data, Data Only, Descriptor Only, and | |
Read Data from Echo Buffer. The permissible values for Buffer ID, Buffer Offset, are as follows: | ||
| ||
| Combined Header and Data – In this mode, data to be transferred is preceded by a | |
| contains the buffer capacity. The resulting descriptor and data are transferred to the initiator during the | |
| command’s | |
0000b | Buffer ID must be 0 | |
| ||
| Buffer Offset must be 0 | |
| Allocation length must be set to between 0 and 516 (4 bytes of header and up to 512 bytes of data). | |
|
| |
| Data Only– In this mode, the | |
| Buffer ID. When | |
0010b | ID of zero is specified, the buffer referenced is the same as if a Buffer ID of one were specified. | |
Buffer Offset. When | ||
| ||
| of sectors/track multiplied by 512. This value must be either a zero or a multiple of 512. | |
| Allocation Length Must be between zero and the maximum number of sectors/track multiplied by 512. | |
|
| |
| Descriptor Only | |
| When requesting a descriptor (a description of the buffer referenced in the Buffer IDfield), the resulting | |
| data is the offset boundary requirements and the length of each buffer. | |
0011b | Buffer ID When | |
er ID of 0 is specified, the buffer referenced is the same as if a Buffer ID of 1 were specified. | ||
| ||
| Buffer Offset Must be zero | |
| Allocation Length Must be between 4 (header) and the maximum number of sectors/track multiplied | |
| by 512 + header size. | |
1010b | Read Data from Echo Buffer | |
| In this mode, the drive transfers data to the host from the echo buffer. The echo buffer will transfer the | |
| same data as when the WRITE BUFFER command with the mode field set to echo buffer was issued. | |
| Buffer ID Ignored. | |
| Buffer Offset Ignored. | |
|
|
Maxtor Atlas 10K V |