MGMT 1050 Lecture Notes - Lecture 16: Data Retention, Flash Memory
MGMT 1050 Lecture 16 Notes – Solid state memory
Introduction
• A few high-capacity optical disks could store all the medical records and history for a
large insurance company, for example.
• Most modern programs are supplied on DVD or CD-ROM.
• Of the various secondary storage components, flash memory and disk devices are the
fastest, since data can be accessed randomly.
• In fact, IBM refers to disks as direct access storage devices (DASDs).
• With tape, it may be necessary to search sequentially through a portion of the tape to
find the desired data.
• Also, the disk rotates continuously, while the tape will have to start and stop, and
possibly even reverse direction and rewind to find the desired data.
• These factors mean that tape is inherently slower unless the data is to be read
sequentially.
• This makes tape suitable only for large-scale offsite backup storage where the entire
contents of a disk are transferred to tape to protect the data from a potential
catastrophe or to meet legal long term data retention requirements.
• Although magnetic tape storage had large inherent cost and storage capacity
advantages in the past that is no longer the case
• The use of tape is decreasing as businesses replace their equipment with newer
technology.
• Flash memory is nonvolatile electronic integrated circuit memory, similar conceptually
to the read-only memory discussed, but different in technology.
• The difference makes flash memory suitable for use in situations where traditional ROM
would be impractical.
• Whereas traditional ROM must be read, erased, and written in large blocks of
addresses.
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