Portable solid-state storage using USB.

Hard drive rotating at approximately 5,400 revolutions per minute.

Waiting time for a disk sector to rotate into position.

Removable flash-based storage medium.

Hard drive rotating at approximately 7,200 revolutions per minute.

Combined delay for positioning and accessing disk data.

Secure Digital removable flash-memory card.

High-speed hard drive rotating at 10,000 RPM.

Drive that reads or writes optical discs.

Small Secure Digital memory card format.