I’ve got a Samsung HD103SI/SRA.
There’s no info regarding RPM on the sticker, and searching the model number online has yielded conflicting results, featuring both 5400 and 7200 for the same model number.
HD Tune has produced this result, which would made you think my disk is actualy 5400 rpm according to some online discussions.
The vertical width of the yellow dots roughly equals to 11ms which supposedly is the latency for a 5400 drive (opposed to 8ms, which would be the one for 7200).
However, SiSoftware Sandra reports it as being 7200, but I’m not sure where it got this value from.
