User manual MAXTOR ATLAS 15K II

[. . . ] Maxtor Atlas 15K II Product Manual September 6, 2005 PN: 000001910 Revision 3 © September 6, 2005 Maxtor Corporation. Printed in U. S. A. This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein ­ which will be incorporated in revised editions of the publication. Maxtor may make changes or improvements in the product(s) described in this publication at any time and without notice. [. . . ] The command that has the CHECK CONDITION will complete without error before any informational exception condition will be reported. This method of reporting instructs the disk drive to report informational exception conditions by returning a CHECK CONDITION status on any command. The sense key will be set to NO SENSE and the additional sense code will indicate the cause of the informational exception condition. The command that has the CHECK CONDITION will complete without error before any informational exception condition is reported. Only Report Informational Exception Condition On Request. This method of reporting instructs the disk drive to preserve the informational exception(s) data. To learn about these exception conditions, the application client polls the disk drive via an unsolicited REQUEST SENSE command. The sense key is set to NO SENSE and the additional sense code will indicate the cause of the informational exception condition. Vendor-specific. 4h 5h 6h 7h ­ Bh Ch ­ Fh 5-62 Maxtor Atlas 15K II SCSI Description 5. 13 MODE SELECT (10) Command (55h) The MODE SELECT (10) command allows the initiator to modify certain mode pages and thereby control some of the drive's operational characteristics. Refer to MODE SELECT (6) for additional descriptions. See Table 5-85 for the data format of the MODE SELECT (10) Command Descriptor Block. See MODE SELECT (6), Table 5-88, for descriptions of the fields. See Table 5-86 for the Mode Parameter Header (10 Byte) -- Data Format and Table 5-87 for the Mode Parameter Block Descriptor ­ Data Format. See Table 5-48 for mode parameter block field descriptions. Table 5-85 MODE SELECT (10) Command Descriptor Block-Data Format Bit Byte 0 1 2-6 7-8 9 Reserved 7 6 5 4 3 2 1 0 Operation Code (55h) PF Reserved Parameter List Length Control Reserved SP Table 5-86 Mode Parameter Header (10-Byte)-Data Format Bit Byte 0-1 2 3 4-5 6-7 7 6 5 4 3 2 1 0 (MSB) Mode Data Length (LSB) Medium Type Device-Specific Parameter Reserved (MSB) Block Descriptor Length (LSB) Table 5-87 Mode Parameter Block Descriptor-Data Format Bit Byte 0-3 4 5-7 7 6 5 4 3 2 1 0 (MSB) Number of Blocks (LSB) Density Code (MSB) Block Length (LSB) Maxtor Atlas 15K II 5-63 SCSI Description Table 5-88 Mode Parameter Block Descriptor-Field Descriptions Data Field Number of Blocks Density Code Block Length Description The value in this field specifies the number of logical blocks on the disk to which the density code and block length fields apply. A value of 0 in this field indicates that all of the remaining logical blocks on the disk have the medium characteristics specified. The Density Code field is unique for each device type. The value in this field specifies the length in bytes of each logical block described by the block descriptor. 5-64 Maxtor Atlas 15K II SCSI Description 5. 14 MODE SENSE (6) Command (1Ah) The MODE SENSE (6) command allows the initiator to read the drive's sector descriptor and mode pages. The MODE SENSE Command Descriptor Sector is shown in Table 5-89 and the data fields are described in Table 5-90. The Mode Parameter Header is shown in Table 5-91 and the data fields are described in Table 5-92. Table 5-89 MODE SENSE (6) Command Descriptor Block-Data Format Bit Byte 0 1 2 3 4 5 PC Reserved 7 6 5 4 3 2 1 0 Operation Code (1Ah) DBD Page Code Sub Page Code Allocation Length Control Reserved Table 5-90 MODE SENSE Command-Field Descriptions Data Field DBD Description Disable Block Descriptor. When the value is 0, the drive returns its Block Descriptor followed by the requested page(s). When the value is 1, the drive returns only the requested pages. Determines which type of page values are returned. [. . . ] The number of tracks written within each inch of disk's surface, used as a measure of how closely the tracks are packed on a disk surface. TRACK ­ One of the many concentric magnetic circle patterns written on a disk surface as a guide for storing and reading data. TRACK DENSITY ­ How closely the tracks are packed on a disk surface. The number is specified as tracks per inch (TPI). Maxtor Atlas 15K II G-11 Glossary TRACK-TO-TRACK SEEK TIME ­ The time required for the read/write heads to move to an adjacent track. [. . . ]