Rogue Coder, thanks for the info! I too would like to know if this is bootable.
Allan, on the ATA-100 bus of your MDD, those $3 SATA to PATA drive adapters will give you almost the performance of a Firmtek card**. I use this one in one of my MDD's and it is bootable:
http://www.amazon.com/SATA-PATA-Drive-Interface-Adapter/dp/B002Y2NI4M/ref=pdybh_2?pf_rd_p=280800601&pf_rd_s=center-2&pf_rd_t=1501&pf_rd_i=ybh&pf_rd_m=ATVPDK IKX0DER&pf_rdr=1Z68ZA0PG1HP0JAFMCHZ
I moved the Firmtek card that was in this machine to my Sawtooth where it made a much bigger impact compared to the ATA-66 bus.
**Let me clarify exactly what I have tested since it's possible that better drives could reveal greater differences between the two:
Xbench disk test scores
WD Caviar Blue WD5000KSRTL with Firmtek: 81
WD Caviar Blue WD5000KSRTL with $3 adapter: 78
WD Caviar Green WD15EADS with Firmtek: 89
WD Caviar Green WD15EADS with $3 adapter: 85
Just a note related to Green drives: Stay away from the EARS models with the 4KB sectors, but I find that the EADS models provide decent performance and very good value if you need a lot of storage space in your G4.