@A1200
Should work just fine. I had mine set up like that until the PSU died (old age, came with my A500 in 1988) and currently use a 95 watt AT PSU (ugly but small), until I get a replacement A500 PSU or find a way to customize this one. Too many cables, looks ugly etc. Mine, Blizzard with 50MHz CPU, no FPU yet, 64MB, 2.5 HDD & laptop CD. I am considering a silent flash drive for mine as well.
Silence is golden. I don't really hear the HD much, but when a CD is in the drive, well, the silence is gone.