Dear cmacnichol,

It's great to know the eSATA box works now.

After installing ASMedia v1.4.1, our MediaSonic HF2-SU3S2 works normally.
4 HDD can be recognized by system and the boot time is still normal.
I tried to duplicate your symptom for many times, but I couldn't see it at my side.

About the boot time question, please kindly help to test the eSATA box to another system to check if it's related to the device.

Thank you very much!

Have a nice day
ASRock TSD
Emily