for the next access, which takes about 1s. This effect would be particularly problematic if an operating system is being run from the drive, as seen in the case of the Palm LifeDrive. Since they are thicker than flash-based CF cards, Microdrives require a Type II slot. Many newer compact cameras only have a Type I slot due to the increasing popularity of flash-based cards, so Microdrives have limited popularity outside of the professional photography market. Certain bus-powered CF card readers lack the power needed to run a Microdrive although they do take CF II cards. When using such a device, it will usually be detected by the host, but errors will occur once the user attempts to access the drive. Some "OEM Only" drives use the CompactFlash form factor but only provide a 5V IDE/ATA interface. These will not work in readers or devices which expect a 3.3V interface and full CompactFlash functionality. Microdrive models by manufacturer IBM Microdrive 170 MB 340 MB 512 MB 1 GB 4 GB 8 GB 16 GB Several physical examples of Microdrives are held by the Computer History Museum. Hitachi Microdrive 512 MB 1 GB 2 GB 3 GB 4 GB 5 GB 6 GB 8 GB IBM and Hitachi models were fitted with 128KB of cache memory. GS Magicstor 2.2 GB ATA, USB (NATIVE), & CF variants 3 GB ATA 4 GB ATA & CF variants 6 GB Seagate ST1 2.5 GB 4 GB 5 GB 6 GB 8 GB 12 GB These Seagate models were fitted with 2MB of cache memory. Sony Compact Vault 2 GB (rebadged Hitachi) 4 GB (rebadged Hitachi) 5 GB (rebadged Seagate) 8 GB (rebadged Seagate) Toshiba 2 GB 4 GB Cornice 2 GB 4 GB 8 GB Western Digital 6 GB See also Digital camera Hard disk drive HP Kittyhawk microdrive References External links IBM family of Microdrives - HGST Review: IBM's 1GB Microdrive – review on MP3 Newswire Hitachi Global Storage Technologies (HGST) Review of Seagate ST1 5GB 1-inch hard disk for CF Hard disk drives Divested IBM products Hitachi IBM storage devices Computer-related introductions in 1999