Seagate ST19171W Product Manual - Page 17
SCSI Interface Prod, uct Manual, SCSI Interface Product Manual, Barracuda 9 Installation Guide - rpm
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Barracuda 9 Product Manual, Rev. C 7 3.2 Media characteristics The media used on the drive has a diameter of approximately 3.5 inches (86 mm). The aluminum substrate is coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection. 3.3 Performance • Supports industry-standard Ultra SCSI interface (also called "Fast-20 SCSI") [1] • Programmable multi-segmentable cache buffer • 7,200 RPM spindle; average latency = 4.17 msec • Command queuing of up to 64 commands • Background processing of queue • Supports start and stop commands (spindle stops spinning) Note. [1] Some host adapter companies support the term "Fast-20 SCSI." 3.4 Reliability • 1,000,000 hour MTBF • LSI circuitry • Balanced low mass rotary voice coil actuator • Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.) • Incorporates Seek To Improve Reliability algorithm (STIR) • Dithering algorithm • 5-year warranty 3.5 Unformatted and formatted capacities Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per sector. The following table shows standard OEM model capacities: ST19171 Formatted [1] 9.1 Gbytes [2] Unformatted 11.7 Gbytes Notes. [1] Standard OEM models are formatted to have 512-byte sectors. Sector size selectable at format time. Users having the necessary equipment may modify the data block size before issuing a format command and obtain different formatted capacities than those listed. User available capacity depends on spare reallocation scheme selected. See Mode Select Command and Format Command in the SCSI Interface Product Manual, part number 77738479. [2] The number of data tracks per sparing zone and the number of alternate sectors (LBAs) per sparing zone can be determined by using the Mode Sense command and reading Mode page 03h. 3.6 Programmable drive capacity Using the Mode Select command, the drive can change its capacity to something less than maximum. See Table 5.2.1-13 in the SCSI Interface Product Manual, part number 77738479. Refer to the Parameter list block descriptor, number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not change the capacity it is currently formatted to have. A number in the number of blocks field that is less than the maximum number of LBAs changes the total drive capacity to the value in the block descriptor number of blocks field. A value greater than the maximum number of LBAs is rounded down to the maximum capacity. 3.7 Factory installed accessories The Barracuda 9 Installation Guide, part number 83329020, is shipped with each standard OEM drive (unless otherwise specified). A small bag of jumpers are also shipped with the drive. Use these jumpers to configure the option headers (J2 and J6).