Hmm... trying to add something useful to the discussion:
It may help to know how the oncoming SATA drive will be identified by the system, and how that compares to IDE drives in Linux.
Usually, IDE drives mounted internally are identified as /dev/hda, /dev/hdb, and so forth. IDE optical drives may also fall in this list as well (for example, the DVD drive on my wife's PCLinuxOS machine is /dev/hdc)
USB devices, and SATA devices will typically be identified as /dev/sda, dev/sdb, etc. The SATA drive in my laptop is /dev/sda.
Partitions on a drive are numbered, and partitions 1 - 4, inclusive are set aside for Primary partitions, while those from 5 onward are Extended partitions. The hard drive in my laptop is partitioned into sda1, sda5, and sda6 since it only has one active Primary partition.
If you are going to install that monster 3TB drive, please consider partitioning it into manageable chunks or you will wind up with one great big honkin' mess of a file system.
Are you using a motherboard that supports IDE and SATA on the board, or using a plug-in card for the SATA drive? If it's the latter case, you'll want to be sure the plug-in board is compatible with PCLinuxOS. (Are you certain you're using an IDE hard drive presently? 500 GB IDE drives were kinda rare anyhow, and are becoming more so with the passage of time. Performance-wise, you'd probably like SATA better, anyhow, if the drives spin quickly enough.)
I'd better stop or I'll have written War & Peace here.
Hope it goes well for you.