User manual MAXTOR MEDIALIST 1080SL

[. . . ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Medalist 1080sl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SCSI Interface Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Medalist 1080sl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SCSI Interface Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] If the DPO is zero, the cached data has the highest priority for being retained in the cache. If the forced unit access (FUA) bit is one, the drive must access the disc to get the data requested by the initiator, even if the data is available in the cache. If the FUA bit is zero, the drive can get the data from the cache or the disc. Bytes 2­5 Bytes 7­8 The logical block address specifies the logical block where the read operation begins. The transfer length specifies the number of contiguous logical blocks of data to be transferred. A transfer length of 0 means that no logical blocks are to be transferred. This condition is not considered an error. 3. 5. 3 Write Extended command (2AH) When the drive receives the Write Extended command, the drive writes the data from the initiator to the disc. This command is like the Write command, except that the CDB for this command contains a 4-byte logical block address and a 2-byte transfer length. For more information about the Write command, see Section 3. 4. 7. 56 Medalist 1080sl SCSI Product Manual, August 1995 If there is a reservation access conflict, this command terminates with a reservation conflict status and no data is written. For more information about the reservation conflict status, see Section 3. 2. Bytes 0 1 2­5 6 7­8 9 Byte 1 0 0 0 0 0 Bits 7 0 6 0 LUN 0 5 1 4 0 DPO 0 0 3 1 FUA 0 0 2 0 0 0 0 1 1 0 0 0 0 0 0 0 0 Logical block address Transfer length If the disable page out (DPO) bit is one, the cached data that the drive receives during this command has the lowest priority for being retained in the cache. If the DPO is zero, the cached data has the highest priority for being retained in the cache. If the forced unit access (FUA) bit is one, the drive must access the disc to write the data sent by the initiator, even if the data can be stored in the cache. If the FUA bit is zero, the drive can write the data to the cache or the disc. Bytes 2­5 Bytes 7­8 The logical block address specifies the logical block where the write operation begins. The transfer length specifies the number of contiguous logical blocks of data to be transferred. A transfer length of zero means that no logical blocks are to be transferred; this is not an error. Medalist 1080sl SCSI Product Manual, August 1995 57 3. 5. 4 Seek Extended command (2BH) The Seek Extended command requests that the drive seek to the specified logical block address. This command is the same as the Seek command, except that the CDB includes a 4-byte logical block address. The Seek command is described in Section 3. 4. 8. Bytes 0 1 2­5 6 7 8 9 0 0 0 0 0 0 0 0 0 0 0 0 Bits 7 0 6 0 LUN 5 1 4 0 0 0 0 0 0 3 1 0 0 0 0 0 2 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 Logical block address 3. 5. 5 Write and Verify command (2EH) When the drive receives the Write and Verify command, it writes the data sent by the initiator to the media and then verifies that the data is correctly written. If the host adapter supports disconnection, the drive disconnects while it is executing this command. Bytes 0 1 2­5 6 7­8 9 Byte 1 0 0 0 0 0 0 Bits 7 0 6 0 LUN 5 1 4 0 0 0 0 3 1 0 0 0 2 1 0 0 0 1 1 BytChk 0 0 0 0 0 0 0 Logical block address Transfer length If the byte check (BytChk) bit is zero, the drive verifies the media after a write by checking the ECC syndromes. If the BytChk bit is one, the drive verifies the media after a write by performing a byte-by-byte comparison of the data stored. 58 Bytes 2­5 Bytes 7­8 Medalist 1080sl SCSI Product Manual, August 1995 The logical block address field specifies the logical block where the drive begins writing and verifying the data. The transfer length field specifies the number of contiguous logical blocks to be transferred. [. . . ] ID ATN­ SEL­ BUSY­ 1 0 1 0 I/O­ MSG­ 1 0 1 0 1 0 1 C/D­ REQ­ ACK­ T09 T10 T11 Figure 10. Command, status, command complete message and bus free Description Command to status Status to command complete message Command complete message to bus free Message in byte transfer Status byte transfer Symbol T05 T18 T19 T32 T34 Typical <150 µsec <100 µsec <0. 1 µsec <0. 1 µsec Max Command-dependent -- -- 0. 15 µsec 0. 15 µsec 114 0 Medalist 1080sl SCSI Product Manual, August 1995 DB(7­0, P)­ 1 0 1 0 1 0 Last byte Disconnect Arb. ID ATN­ SEL­ BUSY­ 1 0 1 0 I/O­ MSG­ 1 0 1 0 1 0 1 C/D­ REQ­ ACK­ T09 T10 T11 Figure 11. Last command byte, disconnect message, bus free and reselection Description Command to disconnect message Disconnect message to bus free Disconnect to arbitration (for reselect). [. . . ]