Secondary Storage

  • Disk Caching
  • Gile Compression
  • File Decompression
  • Internet Hard Drive
  • Optical Disc Drive
  • Solid-State Storage
Disk Caching
  • is a mechanism for improving the time it takes to read from or write to a hard disk 
  • included as part of the hard disk
  • can also be a specified portion of random access memory(RAM)
  • holds data that has recently been read and, in some cases, adjacent data areas that are likely to be accessed next



File Compression
  • also know as Data Compression
  • to encode data before sending it to another place
  • commonly used when sending a file from one computer to another over a connection that has limited bandwidth
  • makes the file smaller and, therefore, the sending of the file is faster


File Decompression
  • reverse of  file compression-decoding of compressed data to restore the unique data


Internet Hard Drive
  • to access user's computer files such as pictures, documents, music, videos, etc. from any computer, as long as that computer has access to the Internet
  • unlike local hard drive, an internet hard drive provides unlimited disk space
  • lower risk to loose documents

Optical Disc Drive
  • also known as ODD
  • uses laser light or electromagnetic waves to read the data from a disc
  • used in computers to read software and consumer media distributed in disc form, and to record discs for archival and data exchange

Solid-State Storage
  • also known as SSD
  • is a data storage device that uses solid-state memory to store data providing access in the same manner of a traditional hard disk drive
  • it contains no mechanical parts, everything is done electronically
  • data transfer at a much higher speed

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