Just successfully flashed my 93450c drive, *phew*, there's some tips I'd like to relay, as I was having similar difficulties to people posting in this (and other) threads. Drive not recognizing as you launch JF? That's OK, status 0x80 on intro? That' OK too! Just click yes on the vendor prompt after the intro fails, pull the power from the drive (easier to pull from the motherboard) and reconnect it right away, status 0x72.... and away we go...
My TOOLS:
Art-Scalpel
18 and/or 20 and/or 22 ohm 1/4 v resistor
patch wire
25 watt crappy shack soldering iron
silver solder w/ rosin core
flux (still not sure if I used this correctly)
de-soldering braid (best 7 bux I spent)
pci sata card w/ via 6421 chipset (not sure if this was necessary)
used xbox for power source
did not use a switch, did not use a multimeter
Check out the rest of my post, I imagine there are similarities among us...
Day 1, I initially had an electronics professional perform the soldering for the boxxdr method (for free, thanks brother in law!), but my drive would not recognize. I had a promise sata chipset running windows 7 32 bit and neither JF or dosflash32 would recognize my drive. I tried a 22 ohm resistor, and an 18 ohm resistor, still would not recognize.
Day 2, picked up a PCI Sata controller card, via 6421a chipset, JF and dosflash32 still did not recognize the drive. Tried a USB to SATA device (which I know now would never have worked) on 3 different computers, one running windows 7 64 bit, still not detected. Drivers updated/removed, not removed, etc.
Day 3, changed out the switch, from a toggle on off, to a three prong on/off slider switch... still not detected.
Day 4, removed all the solder wires, resistor, patched all the traces with wire, and admitted defeat... drive still worked for retail games.
Day 5, saw some pics regarding pad 101, and how the pad 101 should be soldered with the trace, to the patch wire, I wasn't sure this was done on my PCB, so I took the drive apart again, and sure enough, the pad 101 did not have any silicon removed from it, and the wire was only attached to the trace, it's possible my brother in law thought that scraping pad 101 from the pics was part of a sloppy solder job and didn't do it. Scraped clean half of pad 101, de-soldered all the previous work with the braid, re-soldered the patch cables, didn't use a switch (just use a clamp tweezer to hold the resistor and patch wire together)...
Hooked up the DVDROM ribbons, used the xbox to power the drive (plug in a/v cable), launched JF, performed intro, clicked yes on vendor prompt, pulled power for drive from xbox motherboard and reconnected it right away, performed intro again, released clamp tweezers (same as turning switch off) JF read the drive fine, wrote the drive fine.
I didn't see a drive show up in JF until the Outro step, after the flashing had completed.
The initial intro failing I think is what's throwing a lot of us off, just click yes and pull power / reconnect power and then check the status!
G'luck!