that 06 and 05 bit was just speculation, truthfully now all xboxs(new) that I have seen all come from the 05 China Factory, 06 was China 2 but i dunno what happened with that.
well as my memorey comes 2 be there is a Total of 8 Drives for the XBOX(6 Stock and 2 Modded)
for Samsung there is
605B-The Good 1 you all hear about
605F-The New 1 that reads Jack Shit, remember the Trays are Identicle so u need 2 open the machine 2 tell
then the 2 Modded Samsungs
616F-These Should Peform the same as the the 605B as it uses the Firmware from the 605B drives
616T-same as 616F
then the Phillips you got
2001
2003-Pot tweaked not 2 read DVD-R if I remember right
2004-Usually made in June/July, should read everything, model number is VAD6035/21
and of course the Thompson Drive, I also herd rumors of 2 versions to this Drive, but was never confirmed.
now down 2 opinion on drives, I myself have ran into 3 Drives
the 2003 Phillips, this 1 was real shitty, if u left a game disk in the drive when u shut it off, then when the machine was booted backup it would ALWAYS give a Dirty Disc Error(guessing just a bad drive), so I returned that system within 2 days after purchasing it. I then got me a Samsung 605B, works good, no DVD burner so I've never tried Burned DVDs yet, but it has read all Burned CD-R/RW I have thrown in it. now I have the new Phillips Drive(in hand and a Spare), havn't tried anything with it but originals, this came out of a CDN Crystal tho.
and from reading ability and reliablity, this is my opinion, some may agree/disagree
Phillips v3
Samsung 605B
Samsung 616F/T
Phillips v1
Phillips v2
Thompsom