Hitachi HDS728080PLAT20 Specifications - Page 199
Set Transfer mode, Write Cache, Advanced Power Management
UPC - 829686000094
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Note: After the power on reset or hard reset the device is set to the following features as default. Write cache ECC bytes Read look-ahead Reverting to power on defaults Release interrupt Enable 4 bytes Enable Disable Disable 12.37.1 Set Transfer mode When the Feature register is 03h (= Set Transfer mode) the Sector Count Register specifies the transfer mechanism. The upper 5 bits define the type of transfer and the low order 3 bits encode the mode value. PIO Default Transfer Mode PIO Default Transfer Mode, Disable IORDY PIO Flow Control Transfer Mode x Multiword DMA mode x Ultra DMA mode x 00000 000 00000 001 00001 nnn (nnn=000,001,010,011,100) 00100 nnn (nnn=000,001,010) 01000 nnn (nnn=000,001,010,011,100,101) 12.37.2 Write Cache If the number of auto reassigned sectors reaches the reassignment capacity of the device, the write cache function will automatically be disabled. Although the device still accepts the Set Features command (with Feature register = 02h) without error, the write cache function will remain disabled. For the current write cache function status, refer to (word 85 or 129) in Table 86: "Identify device information (Part 1 of 7)" on page 136. 12.37.3 Advanced Power Management When the Feature Register is 05h (=Enable Advanced Power Management) the Sector Count Register specifies the Advanced Power Management level. FFH C0-FEh 80-BFh 01-7Fh 00H Aborted The lowest Power Saving Mode is Normal Idle mode (the same as Disable Advanced Power Management) The lowest power consumption mode is Low Power Idle The lowest power consumption mode is Low RPM standby mode Aborted The idle time to Low power idle mode and Low RPM standby mode vary according to the value in Sector Count register as follows: When Low power idle mode is the deepest Power Saving mode, y1 = (x − 80h) 5+ 120[sec] (120 ☯y1 ☯435) y2 =N/A (the device does not go to Low RPM standby mode) Deskstar 7K80 Hard Disk Drive Specification 195