Differences

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--- himd_device_control [2010/05/21 17:44] – megadiscman
+++ himd_device_control [2010/06/27 10:20] (current) – Fix time bit numbers megadiscman
@@ Line 20: / Line 20: @@
     * Bit 1: FUA ("force unit access": write now, don't cache)
-This command generates a new Disc ID, as the ID is fixed on 1GB media, it is rejected on 1GB 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 ===
@@ Line 29: / Line 29: @@
     * Bit 2: NOFS (Don't generate FAT FS? - must be cleared on RH-1)
-This command works on 1GB and standard MD media. The disc ID stays constant during formatting.
+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 70: / 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