In a joint venture with SanDisk, Sony released yet another new Memory Stick format on 6 February 2006. The new Memory Stick Micro (M2) measures 15 x 12.5 x 1.2 mm-roughly one-quarter the size of the Duo, around the size of a fingernail-with 256 MB, 512 MB and 1 GB capacities (could theoretically have 32 GB in the future). Maximum transfer speed is 160 Mbit/s. It comes with an adaptor, much like the Duo Sticks, to ensure compatibility with current Pro devices.

Transfer speeds

Standard:

• Maximum write speed: 14.4 Mbit/s (1.8 MB/s)
• Maximum read speed: 19.6 Mbit/s (2.5 MB/s)

Duo/Pro Duo:

• Transfer: 160 Mbit/s (20 MB/s)
• Minimum write speed: 15 Mbit/s
• Maximum write speed: 80 Mbit/s (High Speed Pro Duo)

Micro (M2):

• Transfer: 160 Mbit/s (20 MB/s)

Form factors

• Standard and Pro: 50.0 mm (W) x 21.5 mm (H) x 2.8 mm (D)
• Duo and Pro Duo: 31.0 mm (W) x 20.0 mm (H) x 1.6 mm (D)
• Micro: 15.0 mm (H) x 12.5 mm (W) x 1.2 mm (D) (i.e., ~1/4 the size of Duo)