How many RPM does my HDD have?

Found a comparison tool and compared the two: AnandTech | Bench - SSD

Looks to me like the Samsung is better overall, although I have no idea what to look for to be honest.

Just about any SSD drive is going to get you 5x the speed of a spinner drive. Reliability becomes a factor, read the reviews and go from their, that's what I did.

kbrady1979 said:

Green drives are advertised as Intellipower, not 5400/5900/7200RPM. Most likely they are either 5400 or 5900RPM but there is no way to know short of using scientific equipment to measure the frequency of the drive.

WD says: "Rotational Speed 5400-7200 RPM"
Specifications for the 500 GB WD AV Green Power Serial ATA hard drive (WD5000AVCS, WD5000AVVS)

Was this drive pulled from a DVR? WD says: "WD AV Green"

I took the drive from a NAS, I enherited an old computer from a dead family member so I know nothing about it except that.

EDIT: to be more specific I took the drive from a ZyXEL NSA-310.

alphanumeric said:

If its a 3.5 inch form factor drive its likely a 7200 RPM drive. If its a 2.5 inch form factor drive its likely a 5400 RPM drive. Desktop 3.5 inch drives are usually 7200 RPM drives while laptop 2.5 inch drives are 5400 RPM drives. Green is a power saving version, go Black for more performance.

Form factor has little to do with HDD speed. I've seen 5400 rpm 3.5" HDDs and 7200 rpm 2.5" HDDs. In the case of the WD Greens, rotational speed is supposedly 5400-7200 rpm, according to WD, but in actual practice, they probably spend most of their time around 5400 rpm if not spun down by the computer.

The Greens are OK for storage but lousy for the OS.