Seagate ST19171WC Product Manual - Page 20
Barracuda 9 Product Manual, Rev. C, Notes for s 4.2.
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10 Barracuda 9 Product Manual, Rev. C SCSI interface data transfer rate (asynchronous) [4]: Maximum instantaneous Maximum average Synchronous transfer rate for SCSI Fast-20 (Ultra SCSI) (8 bit data bus models) 5.0 Mbytes/sec [5] 10.0 Mbytes/sec [6] 2.5 to 20 Mbytes/sec Synchronous transfer rate for SCSI Fast-20 (Ultra SCSI) (16 bit data bus models) Synchronous transfer rate for fast SCSI-2 (8 bit data bus models) 5.0 to 40 Mbytes/sec 1.25 to 10 Mbytes/sec Synchronous transfer rate for fast SCSI-2 (16 bit data bus models) 2.5 to 20 Mbytes/sec Sector sizes: Default Variable in even-sector sizes 512-byte data blocks 180 to 4,096 bytes per sector Read/write consecutive sectors on a track Flaw reallocation performance impact (for flaws reallocated at format time using the spare tracks per volume reallocation scheme) Overhead time for head switch (512-byte sectors) in sequential mode Yes 35 msec (typical) 0.8 msec Overhead time for one track cylinder switch in sequential mode 1.2 msec (typical) Average rotational latency 4.17 msec Notes for Sections 4.2. [1] Execution time is measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a status byte transfer to the initiator (excluding connect/disconnect). [2] Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives. These access times do not include average rotational latency time. [3] Assumes no errors and no sector reallocations. [4] Rate measured from the start of the first sector transfer to or from the host. [5] Assumes system ability to support the rates listed 1 byte wide and no cable loss. [6] Assumes system ability to support the rates listed 2 bytes wide and no cable loss. [7] Access time = controller overhead + average seek time. Access data time = controller overhead + average seek time + latency.