First, what kind of capacity are you talking about? With the new crop of high capacity IDE drives, you can get very high storage density for pretty low price, so you may be able to get what you need with fewer drives. But if you realy need 20 drives, you may not have a simple solution. Most 3.5" drives will generally require about 15 watts each to operate. So for 20 of them, you will need a power supply to be able to sustain 300W output, so a 450W power supply will be a minimum recommended size just for them. I don't know if anyone makes a computer enclosure that can hold that many drives, so it means installing them in an external chassis of some sort. Then there is the problem of connecting them to the IDE interfaces on your computer; I don't think IDE cables, even the fancy round ones, can be more than a couple feet long, and most of them are for connections within the same cabinet. This means you need some form of controller to convert the protocol into something that can be driven over a meter outside of the enclosures, like SCSI or FCAL. So this implies some kind of RAID controller for the drives and a SCSI or FCAL HBA. There are a number of sources for low-cost RAID systems using IDE drives and SCSI or FCAL host interfaces. Here's an example controller with enclosure: http://www.scsi4me.com/?menu=menu_subsystem&pid=3381 You then add up to 16 drives to this. If you need more drives, you will have to get a second unit. This is a rack-mount system, but the desk-top model is the same unit with rubber feet and no rack mount slides. eyc