If they will not be in a multi-disk RAID array, then it won't matter if they are SAS or SATA (although NL-SAS will cost a little more at 2TB than a SATA drive). If Dell doesn't have what you need, you should be able to find third-parties that do: [URL] SATA[URL] NL-SAS Note that the 2950 supports either 2.5" or 3.5" drives, but not both ... you will need to shop for the size your server has.        
Hi , we are trying to get some new disks for our Dell PowerEdge 2950, but our provider tell us that theres no supply of disks because of the flood  problems in Thailand. So the question is if exist  any special specification of the hard disks for that machine so we can get them on our own, or if any of you have a recommendation we will appreciate it. Thanks and regards .. 
Hard Disks for PowerEdge 2950