I looked at the hard drives and they are:
Seagate: (I have 4 of these) +5V 0.75A
Maxtor: (I have 6 of these) +5V 740mA
Leading out of PS:
cord with: 2 SATA power connectors
cord with: 1 PATA and 1 for floppy drive
cord with: 1 power connector w. 6 sockets (5 have connectors inside) and 2 PATA power connectors
I also placed 3 PCI IDE expansion cards in the server.
My question is - what is the proper way to do the math to find out the maximum number of hard drives that the PS can support?
And do you think it is safe to plug all of those 10 hard drives that I have?
Well your #1 limiting factor is going to be the # of hdd bays in that chassis, according to Dell's info page it only has 2 non-hot-swap bays... Also you didn't mention your specific config like Celeron or P4, amount of memory and other options like embedded raid, etc. Best bet, go to the Dell support page, plug in your service tag, and post all your system specific details it will help us help you.
BTW nice details on the hdd's here is the wattage for that:
3.75w+4.2w=7.7w per seagate *4 = 30.8w
3.7w+18w=21.7w per maxtor * 6 = 130.2w
161w total hdd power consumption, if you can mount them that is 8)
Not sure I would be comfortable loading it up any further... One idea would be to get a cheap (but decent) PSU just for the HDDs like this SPARKLE FSP250-60ATV ATX 250W (it's under $30, good quality components, not the greatest efficiency ) and dedicate it to all your hdd's and connect it like this to have it sync the power up:
Make sure to check the pinouts on the dell first :wink: