SD card that was 1.4 mm by 21.5 mm by 20 mm and weighed 1 g and a Micro SD card which was 1 mm by 11 mm by 15 mm and weighs virtually nothing. As you may have noticed, Mini SD cards and Micro SD cards were not compatible with MMC microcards. Seek times were similar to MMC. Rather like the memory stick, the SD card had separate file directories for voice (SD voice), audio (SD audio) and video (SD video). 9.5.2.7 xD Picture Cards13 Introduced by Toshiba, Fuji and Olympus in 2002, Picture Cards had a depth of 1.7 mm, a width of 20 mm and a length of 25 mm, weighed 2 g and were presently available in capacities up to1 GB with a 2- to 8-GB product road map similar to the memory stick. A 1-GB card would store about 18 minutes worth of Quick Time movie at VGA resolution (640 by 480) at a frame rate of 15 fps including sound, or 9 minutes at 30 fps. 9.5.2.8 USB Flash Drives/Portable Hard Drive Slightly different in that they were specifically designed for moving data files on to or from a hard disk, USB flash drives plugged straight into the USB port. This did not mean that you had to have a 12 mm by 4 mm USB port in the host device but delivered flexibility in terms of plug in I/O functionality (hot swapping, USB hubs and all those other nice things that USB ports deliver). The objective was to have devices that were compatible with the USB2.0 standards15 for high-speed USB that included transfer rates of up to 480 Mbps. This became standardised as USB 2.0 and remains a ubiquitous method of providing connectivity with computing devices and of delivering power for devices that need recharging). The lessons from this are, however, salutary. The adoption of plug in solid-state memory has not been helped by the bewildering choice of formats and form factors that resulted in a loss of scale economy and an offer to consumers that was completely incomprehensible to the majority of the buying public. Incompatibility between formats and an inability to export and import data between formats compounded the problem. This has almos