An information storage device includes a cradle which can removably receive a cartridge that contains a rotatable hard disk. A read/write head is supported for movement adjacent the disk by a pivotal actuator arm. The cradle controls alignment of the head with the disk using feedback servo tracking....http://www.google.de/patents/US6717762?utm_source=gb-gplus-sharePatent US6717762 - Method and apparatus for making a drive compatible with a removable cartridge
