Flash memory drive

From Conservapedia
Jump to: navigation, search

This page refers to removable USB flash drives, not to be confused with SATA/PATA Solid-state drives

A 1GB USB flash drive

A Flash Memory Drive (a.k.a Thumb Drive, Memory Stick, Jump Drive, and Flash Drive) is a kind of digital data storage device which uses flash memory to store all manner of files and information. These are used for file transfers (from on device to another), and storage. They can be used to simply hold a file for five minutes, or store that file for years, during which time it can be edited and accessed any time.
As flash memory develops, flash memory drives become progressively less expensive while capacity continues to increase. These removable drives are generally connected to devices using Universal Serial Bus (USB) connections.

Technical details

Flash memory is an efficient, non-volatile type of storage which is composed of MOSFET's that have a special "floating gate", so well insulated that it can hold its charge, thereby controlling the transistor, almost indefinitely. The charge in the floating gate can be set using electrical impulses. When disconnected from power, the transistors hold their charge, so data can be stored for quite some time and/or transferred to another device.
Over a period of years (and decades) flash memory tends to suffer from bit rot. Since flash memory drives typically do not offer error correction functionalities as hard drives do, they can eventually lose the data they contain. While flash memory drives are versatile and fairly reliable, this can make them unsuitable or long-term backups and archives. However, they can often be stored without a data refresh for more than a decade with no discernible problem. Rewriting the data to the drive refreshes the electrical charges, which helps ensure that the data will be available for years to come.