Differences

This shows you the differences between two versions of the page.

--- himd_device_control [2010/05/21 17:36] – megadiscman
+++ himd_device_control [2010/06/27 10:20] (current) – Fix time bit numbers megadiscman
@@ Line 17: / Line 17: @@
   * Application ID: 0
   * Used fields: flags.
-    * Bit 0: IMMED ("immediate": finish SCSI handling before command finishes - MUST be set, command is rejected otherwise by the RH-1)
+    * Bit 0: IMMED ("immediate": finish SCSI handling before command finishes - must be set on RH-1)
     * Bit 1: FUA ("force unit access": write now, don't cache)
-**Note:** Seems to work only with Standard MD media.
+This command completely blanks the medium. This is not possible with Hi-MD 1GB media, as the Disc ID is read-only. Standard MD media completely blanked are usable in standard MD devices. This is the only way getting rid of Hi-MD format on a standard MD medium.
 === Subcommand 01: Format HiMD ===
   * Application ID: 0
   * Used fields: flags.
-    * Bit 0: IMMED ("immediate": finish SCSI handling before command finishes)
+    * Bit 0: IMMED ("immediate": finish SCSI handling before command finishes - must be set on RH-1)
     * Bit 1: FUA ("force unit access": write now, don't cache)
-    * Bit 2: NOFS (Don't generate FAT FS?)
+    * Bit 2: NOFS (Don't generate FAT FS? - must be cleared on RH-1)
-**Note:** Maybe works with Hi-MD 1GB media, too.
+This command just reinitializes the Hi-MD data structures on the Medium, but it doesn't remove the Hi-MD layout from it. It generally keeps the Disc ID, as this data is stored *outside* of the area accessible using normal read/write instructions, and only this area is reinitialized.
 === Subcommand 0E: Begin ICV Transaction ===
@@ Line 68: / Line 70: @@
 Reads a 7-byte data packet from the Hi-MD unit with the following layout:
-  Byte 00: Flags. Bit 0 = Ex; Bit 1 = Ef; Bit 2 = WP (write protect?)
+  Byte 00: Flags. Bit 7 = Ex; Bit 6 = Ef; Bit 5 = WP (write protect?)
   Byte 01: second
   Byte 02: minute