Question: Does anyone know if I can install normal 2.5" SATA drives inside an HP DL360 G5 server? Right now it has 6 72GB SAS drives. I am looking for raw storage for my files SAS performance in not required.

Answer: 
SATA2 disks should be compatible with the Smart Array P400i that comes with your server (or any other SAS controller, for the matter), although probably not with stellar performance as others have noted. But keep in mind that not all SATA disks are suitable for use with RAID because of the infamous Time-Limited Error Recovery parameter (TLER for WD drivers, also called ERC by Seagate and CCTL by others). Disks not prepared for RAID configurations will frequently drop from the array.
You should be able use any SATA drive, but I'd consult the bare drive model numbers on HP's *[Hard Drive Model Number Matrix](http://h20565.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=408482&docId=emr_na-c00305257&docLocale=en_US)* before you buy. That'll give you a strong indication of which drives will work well in your server, and point you to any special firmware.

Old question, I know, but it took me ages to find that list.