IBM DTTA-351010 Hard Drive Specifications - Page 20

3.3.4 Data Transfer Speed Description Disk-Buffer Transfer (Zone 0) Instantaneous - typical Sustained - typical Disk-Buffer Transfer (Zone 7) Instantaneous - typical Sustained - typical Buffer-Host (max) Figure 11. Data Transfer Speed DTTA-35xxxx 15.2 Mbyte/sec 12 Mbyte/sec 8.3 Mbyte/sec 6 Mbyte/sec 33.3 Mbyte/sec DTTA-37xxxx 16.2 Mbyte/sec 13 Mbyte/sec 10.1 Mbyte/sec 8 Mbyte/sec 33.3 Mbyte/sec Instantaneous Disk-Buffer Transfer Rate (Mbyte/sec) is derived by: (Number of Sectors on a track) * 512 * (Revolution/sec) Note: Number of sectors per track will vary because of the linear density recording. Sustained Disk-Buffer Transfer Rate (Mbyte/sec) is defined by considering head/cylinder change time. This gives a local average data transfer rate. It is derived by: (Sustained Transfer Rate) = A/ ( B + C + D ) A = (Number of Data Sectors per Cylinder) * 512 B = (# of Surface per cylinder) - 1) * (Head Switch Time) C = (Cylinder Change Time) D = (# of Surface) * (One Revolution Time) Instantaneous Buffer-Host Transfer Rate (Mbyte/sec) defines the maximum data transfer rate on AT Bus. It also depends on the speed of the host. The measurement method is given in 3.3.5, "Throughput" on page 13. 12 OEM Specifications for DTTA-3xxxxx