MGMT 1050 Lecture Notes - Lecture 17: Flash Memory
MGMT 1050 Lecture 17 Notes – Small Block of Flash
Introduction
• It is possible to read individual bytes or small blocks of flash memory when necessary.
• This makes flash memory useful for applications that require random access, particularly
those applications where most accesses are reads.
• Although read accesses and certain simple overwrite accesses are relatively fast, flash
memory must be erased in blocks
• So that most write accesses require an additional step that rewrites the unchanged data
back to the block.
• Furthermore, the erase-and-rewrite operation is very slow compared to the read access.
• Although there is research into other types of nonvolatile memory that might solve this
problem, flash memory is generally considered to be impractical as a replacement for
conventional RAM, at least for now.
• Because of its small size, flash memory is frequently the secondary storage of choice for
the memory cards that plug into portable devices such as cell phones, portable music
players, and digital cameras.
• It is also ell suited for sall, portale thu dries that plug diretly ito a USB
port.
• These drives are useful for moving files and data from one machine to another and also
serve as an inexpensive and convenient backup medium.
• Flash memory is more expensive than disk storage at this writing.
• However, its capacity is rapidly increasing and its price falling.
• As a result, large capacity flash eory uits alled solid-state dries hae appeared
on the market and are starting to supplant disk drives as the long-term storage device of
choice in computers where less weight, low power consumption, and small size are
important.
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