Originally posted by: beergeek
Originally posted by: IronChefM
a bit OT but...
what is the purpose for a HD controller card?
is it only used when you want to set up a RAID config or does it increase trasfer rates in general?
do i also need one if i were to use several HDs in one computer?
An IDE controller card provides the interface and DMA between the IDE bus that the disk sits on and the PCI bus that (effectively) memory sits on. You
need a controller, but normally you don't have to add one, as modern motherboards come with a dual channel IDE controller built-in (it's part of the "Southbridge" chip of the motherboard chipset). Each channel of the controller supports 2 devices on one cable (called the master and the slave). The devices can be HDs, CDs and DVDs (RO or RW), some tape devices, etc. So, with a normal motherboard, you can support up to 4 such devices without adding an additional controller. (Some MBs that have built-in RAID support can handle another 2 HDs beyond the normal devices.) If you need more than 4 devices, you need another controller. Or, if you want
serious RAID support (the built-in stuff isn't serious), you need a heavy duty RAID controller. (A normal add-on disk controller
doesn't support RAID - a true RAID controller is much more expensive. Of course,
really serious RAID would use SCSI or a direct device interface, not IDE, but that's another thread.)
Long explanation - hope it helped...
ted