On the tape size vs. disk physical unit size alluded to in a previous post: that used to be true... not any longer; not for the last 3 years. With both SAS and laptop disk size changes, the difference is minmal... and with 2.5" SAS you can get 10,000 RPM.

I know many places still use tape. I think that is a matter of:

1. Familiarity.

2. Perceived cost to switch implementation.