I don't recall Seagate having a black edition hdd, they do have barracuda, which is the drive for desktops and runs at 7200 rpm.
They also have Constellation that's for enterprise.
WD has Black which also run at 7200 rpm but has a 5 year warranty and cost more than the Barracuda.
WD Red is for NAS, Blue is mainstream also have 7200 rpm, but 2 or 3 year warranty. Green is for Storage and runs at a slower unspecified rpm.
Black is way too expensive, grab a Seagate Barracuda or WD blue drive for storage.