xD (eXtreme Digital) is a memory card format developed by Olympus and Fujifilm in 2002 and originally produced by Toshiba. These three companies are owners of the "xD" trademark. It was developed to replace SmartMedia – it is smaller and have higher capacity.

Figure 9: xD memory card.

Figure 10: Comparison between xD and SmartMedia (SM) memory cards.

Main specs

• Available Capacities: 32 MB, 64 MB, 128 MB, 256 MB, 512 MB and 1 GB (technically can have up to 8 GB)
• Transfer speed: 5 MB/s
• Write speed: 1.3 MB/s (16 MB and 32 MB cards) or 3 MB/s (64 MB and up cards)
• Length: 0.98 in (25 mm)
• Width: 0.79 in (20 mm)
• Height: 0.067 in (1.7 mm)
• Weight: 0.07 oz (2 g)
• For more information: http://www.olympusamerica.com/cpg_section/cpg_xd.asp