Both of the Dell PowerEdge 2900 Servers have one 500GB SATA drive installed in Bay 0 that has an inactivated Windows 10 operating system. These computers do accept a USB drive to boot to if you use the rear USB ports. You could install another operating system like Linux or Windows Server 2012 R2.Server A specs are below:Two Xeon 5130 2.00GHZ CPUs4GB Ram500GB Sata HDD3.5" Floppy DriveDVD DriveOnly one of the two redundant power supplies workServer B specs:I don't have the exact specs on the CPU4GB Ram500GB Sata HDD3.5" Floppy DriveDVD DriveOnly one of the two redundant power supplies workFan number 4 runs at a high RPM and is loud. There is a message on the Dell PowerEdge 2900 front display mentioning something about fan number 4 running a a high RPM.