do 5400 rpm data disks exist?

[tesco]

SATA: http://www.newegg.com/Product/Produc...82E16822148134

Title says "Seagate Barracuda 7200.10 ST3750640AS 750GB 7200 RPM 16MB Cache SATA 3.0Gb/s (The First Perpendicular Recording) Hard Drive - OEM"
What does the highlighted bit mean?

[clocker]

The data bits stand up rather than lay flat.

Or something like that.
It's the way Seagate increased the data density on the disc.

Greatest thing since sliced bread I hear.

[lynx]

With longitudinal (standard) recording each bit has a north pole followed by a south pole, or a south pole followed by a north pole, depending on whether the bit is a zero or a one.

With perpendicular recording the north pole is on the surface and the south pole is on the lower layer (or the other way round) allowing for much greater densities.