Accredited Standards Committee Doc. No.: X3T9.2/91-206 X3, INFORMATION PROCESSING SYSTEMS Date: December 4, 1991 Project: 791-D Ref. Doc.: X3T9/91-148 Reply to: John Lohmeyer Mr. Gene Milligan Seagate Technology MS OKM 251 P. O. Box 12313 Oklahoma City, OK 73157 Dear Gene, Thank you for the comment attached to your X3T9 letter ballot on forwarding the AT Attachment draft standard to X3 and thank you for your subsequent written comment contained in X3T9.2/91-184. Your comments in 91-184 resulted in some editorial clarifications to Table 9-4 of ATA as shown on the back of this page. Your comments (from the X3T9 letter ballot) regarding follow-on work to ATA for battery operation and making the Seek and Recalibrate functions optional will be addressed under the proposed ATA Extensions project. Best Regards, John Lohmeyer, X3T9.2 Chair cc: Dal Allan, ATA Technical Editor Del Shoemaker, X3T9 Chair Bob Fink, X3T9 Vice-Chair Editorial Clarifications to Table 9-4 in AT Attachment Rev 3.0 TABLE 9-4: SET FEATURE REGISTER DEFINITIONS +-----+--------------------------------------------------------------+ | 01h | Enable 8-bit data transfers (see 6.3.5) | | 02h | Enable Write Cache * | | 22h | Write Same Specified Block (see 9.29) | | 33h | Disable Retry * | | 44h | Vendor unique length of ECC on Read Long/Write Long commands | | 54h | Set cache segments to Sector Count Register value * | | 55h | Disable read look-ahead feature | | 66h | Disable reverting to power on defaults (see 9.22) | | 77h | Disable ECC * | | 81h | Disable 8-bit data transfers (see 6.3.5) | | 82h | Disable Write Cache * | | 88h | Enable ECC * | | 99h | Enable Retries * | | AAh | Enable read look-ahead feature | | ABh | Set maximum prefetch using Sector Count Register value * | | BBh | 4 bytes of ECC apply on Read Long/Write Long commands | | CCh | Enable reverting to power on defaults (see 9.22) | | DDh | Write Same Entire User Medium (see 9.29) | +-----+--------------------------------------------------------------+ * These commands are Vendor-specified