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CP1610: Introduction to Computer Components Archival Storage Devices.

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Presentation on theme: "CP1610: Introduction to Computer Components Archival Storage Devices."— Presentation transcript:

1 CP1610: Introduction to Computer Components Archival Storage Devices

2 What is Archival Storage? Similar to secondary storage. Typically more durable. Used for long-term or permanent storage:  Data backups from hard disks;  Permanent storage of data that will not be changed (ex: music or movies);

3 Common Archival Storage Media Optical Storage Flash Memory Magnetic Storage

4 Optical Storage Use light (lasers) to read and write data. Not subject to data loss or corruption. Compact Discs (CD’s) Digital Video Disks (DVD’s)

5 How Optical Storage Works Light is used to burn a series of ‘pits’ (dark spots) on a disk. Dark spots and light spots are read as 0’s and 1’s (binary). Re-writable discs use ‘Phase’ technology:  Special dyes are used that react to the laser;  The ‘Phase’ of the dyes can be changed to change the data.

6 Data Storage on Optical Media CD-ROM drives  Use CDFS (Compact Disc File System) or UDF (Universal Disk Format);  Hold about 780 MB of data. DVD drives  Use only UDF;  Uses the MPEG-2 encoding standard;  Standard hold about 4.5 GB of data.  Dual-layered DVD’s can hold up to 8.5 GB of data.

7 Optical discs have tracks and sectors, just like magnetic disks. Tracks and sectors are arranged in a spiral, instead of concentric circles. Floppy Disk

8 Flash Memory Also called solid-state storage. No moving parts (Data on the media is altered using electrical signals). Relatively high memory capacity. Commonly used for:  USB drives;  MP3 players;  Digital camera memory;  Mobile phone and PDA memory;

9 Multimedia Compression Standards MPEG-1 standard  Image compression for business/home applications MPEG-2 standard  Video film compression on DVD-ROM MPEG-3 standard  Audio compression MPEG-4 standard  Video transmissions over the Internet

10 Magnetic Storage Like a cross between a floppy or hard disk, and an audio cassette. Stores data by aligning magnetic particles on a ‘tape.’ Magnetic particles are read as 0’s or 1’s (binary).

11 Advantages of Magnetic Storage Advantages  Inexpensive and convenient  Large capacity  Several types and formats Disadvantage  Sequential access

12 Other Archival Storage Media ZIP Disks (By Iomega) and SuperDisks (by Imation).  Similar to 3.5 inch floppy disks, but bigger, with more capacity.  Never became popular because of CD’s and DVD’s

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