The firmware update readme/update you have linked to is for updating drives in a PowerVault MD3xxx, which is a storage server usually attached to a server, like a 2950.  So, to reword my question ... are you updating drives in a PowerVault attached to a 2950, or are you updating drives that sit in the actual drive bays of your PowerEdge 2950 server?  If the latter: SAS/SATA Update Utility for 2950:[URL] Readme:[URL] Full Info:[URL] According to these docs, S515 is the latest, so "stepping" the updates would not be necessary. 
Hello all... I have three Seagate Cheetah 15k hard drives to be configured into a Raid 0 in my 2950 system. Two have firmware S513 and one I have on order has S515. I've read that it is best to have all drives in a raid running the same firmware. On the Dell site here: [URL] Is the firmware update for S528. Any issues with installing this version in these drives that anyone is aware of? Thanks!    
Updating hard drive firmware