### device | disc:

Floppy disk
* Explain floppy disk use.
* are a common vector for computer viruses.
* are a poor medium for backing up and storing files
  - relatively unreliable storage device
  - an unacceptable media for storage of corporate records
  - another common magnetic storage medium
  - computer disks
  - different from hard disks in that they are portable
  - floppies
  - less reliable and less durable than hard drives
  - magnetic devices and are negatively affected by magnetic fields
* are notorious for developing read errors over time
  - losing important bits and corrupting files
  - prone to damage from dust and dirt or exposure to magnetic fields
  - removable and are therefore used to transport data
  - slow to transfer information
  - slower in operation, store less information, and are less reliable than hard disks
  - small removable disks that are common to PC 's
  - subject to disk errors much more than hard disks and network servers
* are used for moving information between computers , laptops or other devices
  - storing information
  - vulnerable storage media
* can easily carry viruses between computers
  - lose track of files, especially if files are constantly added and deleted
* come in different sizes and storage capacities
  - two sizes
* function at much slower pace than hard disks do.
* have a relatively short life
  - small openings at the top
* tend to fail at the worst possible times.
* use a flexible vinyl surface covered in magnetic oxides.
  * are used for moving information between computers, laptops or other devices. Some early digital cameras, electronic music instruments and older computer game consoles use floppy disks. Floppy disks are inserted in to a 'floppy disk drive' or simply 'floppy drive' to allow data to be read or stored.
  * store much less data than a CD-ROM disk or USB flash drive. This is usually enough for simple text documents.

### device | disc:

Hard disk
* All hard disks consist of thin platters with a magnetic coating.
* Hard Disks have the capacity to contain several megabytes or even a few gigabytes of data.
* More Hard disk precise, electronic magnetic device.
* Some hard disks have serial numbers
  - use special fluid-dynamic bearings instead of ball bearings
* are an addiction no less than heroin
  - heavy, and are mechanical devices
  - high precision, delicate instruments
  - mechanical devices, though, and they're sensitive to vibrations
  - sensitive to smoke and dust
  - slow in computer terms
* can store much more information than floppy disks.
* come in all different logical sizes
  - varying storage capacity and speeds
* derive their name from the fixed metal surface used to store information.
* drives store data on one or more metal oxide platters.
* have large storage capacities and extremely rapid retrieval speeds.
* hold data in clusters
  - more data and are faster than floppy disks
  - twenty megabytes or more of data
* provide large quantities of inexpensive, permanent storage
  - much more data storage than a floppy
* use a variety of track sizes.
* vary in size, but most lab machines can store one billion characters.
+ Hard disk, Different interfaces: Hard drives
  * Hard disks use different interfaces and ports. An interface usually has two parts. First there is the specification of how the signals are transmitted. This includes what cables to use, what length the cables can be and so on. The second part of the interface definition is the language to use. This speaks about what the signals mean.

Intercalated discs
* help multiple cardiac muscle cells contract rapidly as a unit.
* hold heart muscle cells together.

Mini disc
* Mini Discs are smaller versions of actual regular compact discs.
* audio product that gives listeners digital sound with portable convience.