Hi whabang,
I dunno, but modern harddrives can draw quite a lot of power. One fully packed A2k, with two 7200 RPM-drives, and the PSU would be on it's knees.
Actually, modern hard drives use less power then older hard drives.
My own Amiga 2500 has the following inside it:
A2320 Amber board
A2630 68030 board with 4 megs of NEC memory
A2091 SCSI Controller board with 2 megs of NEC memory
GVP EGS Spectrum Video board with 2 megs of ram
GVP Multi IO board
Fujitsu 1.2 Gig SCSI hard disk drive
Two Chinon 800K Disk Drives
All this stuff inside and the original 210 Watt power supply still runs nice and cool. This is because once a year I remove the top cover of the power supply and blow out all the dust with a can of compressed air. Every 3 years I replace the fan with a new one that is made in Germany or Japan. DUST is the number one killer of power supplies, so it is very important to keep them clean. It is especially important to keep the fan blades clean. If you can not clean the fan then replace it. The new fan MUST be a high quality fan. The best fans are made in Germany and Japan. Do NOT buy one that is made in China or Mexico. Make sure that the new fan has ball-bearings not sleeve-bearings and that it has a rating of at least 32 CFM air flow. Remember that this is the main fan that has to cool the entire inside of the mighty Amiga 2000 computer by sucking air from the inside of the computer, thru the power supply, and then out the rear of the PSU. So this fan MUST be high quality. After you read this then you can see why I never have problems with any of my Amiga 2000 Series power supplies. I take good care of them and they in turn take good care of my Amiga 2000 Series computers.
:-D