IBM DBCA-204860 Hard Drive Specifications - Page 150

AAH Enable read look-ahead feature BBH 4 bytes of ECC apply on Read Long/Write Long commands CCH Enable reverting to power on defaults Warning 1. Hard reset or power off must not be done in 5 seconds after write command completion when write cache is enabled. Note 1. When Feature register is 03h ( = S e t 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 Single word DMA mode x Multiword DMA mode x Ultra DMA mode x 00000 000 00000 001 00001 nnn (nnn=000,001,010,011,100) 00010 nnn (nnn=000,001,010) 00100 nnn (nnn=000,001,010) 01000 nnn (nnn=000,001,010) Note 2. When Feature register is 05h (=Enable Advanced Power Management), the Sector Count Register specifies the Advanced Power Management level. C0h - FEh ... The deepest Power Saving mode is Active Idle 80h - BFh ... The deepest Power Saving mode is Low power Idle 01h - 7Fh ... The deepest Power Saving mode is Standby 00h, FFh ...Aborted When Feature register is 85h (=Disable Advanced Power Management), the deepest Power Saving mode becomes Active Idle. Note 3. If the number of auto reassigned sectors reaches the device's reassignment capacity, the write cache function will be automatically disabled. Although the device still accepts the Set Features command (with Feature register = 02h) without error, the write cache function will remain disabled. For current write cache function status, please refer to the Identify Device Information(129word) by Identify Device command. Note 4. After 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 Address Offset mode : Enable : 4 bytes : Enable : Disable : Disable 142 OEM Specifications of DBCA-2xxxxx 2.5 inch H D D