HDD: 2TB Seagate Barracuda ST2000DM001 (Made in Thailand)
BIOS: M8 (not M8+) from slayers 2.7, modchip is a muppetx
Working adaptor:
http://imgur.com/iPFLZWw, bought from here:
http://www.ebay.com.au/itm/270786530575?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 (the same seller has relisted them, now $4.50). Jumper removed.
Non-Working Adaptors (both would prevent the xbox from booting the cd/dvd, giving a flashing LED and one of a few different dash related error numbers):
-Dealextreme revision 1.0:
http://dx.com/p/sata-to-ide-hard-disk-mini-vertical-bridge-adapter-card-12537
-A different type sold on ebay (without the 2 large capacitors):
http://www.ebay.com.au/itm/290393203018?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Things tested with the 2 non working adaptors, all to no avail:
-2 different chipped xboxes, 2 of each adaptor, with all the variables below on each:
-All jumper positions on the adaptors
-Original 40 pin and 2 different ata133 80 pin IDE cables (all confirmed working with stock HDD)
-M8+ and M8 normal bios
-Slayers 2.7 on cd and dvd, AID
-Powering the adaptor with an external supply to let it boot before powering on the xbox
-Booting with optical drive open (someone suggested this may delay boot process)