Thumb hard drives

Description:Inside the plastic casing is a small printed circuit board, which has some power circuitry and a small number of surface-mounted integrated circuits ICs. Drives typically use the USB mass storage device class to communicate with the host. These had limited capacity, were slow for both reading and writing, required complex high-voltage drive circuitry, and could be re-written only after erasing the entire contents of the chip. Hardware designers later developed EEPROMs with the erasure region broken up into smaller "fields" that could be erased individually without affecting the others. Altering the contents of a particular memory location involved copying the entire field into an off-chip buffer memory, erasing the field, modifying the data as required in the buffer, and re-writing it into the same field.

Views: 2382 Date: 2018-12-26 Favorited: 95