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An overview of various types of storage media, devices, and file systems. It covers the differences between removable and non-removable storage, nonvolatile and volatile data, random and sequential access, and logical and physical file representation. The document also discusses various storage technologies such as magnetic, optical, and electronic storage, and their respective advantages and disadvantages.
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Floppy disk, CD or DVD, etc. Can be removable or nonremovable from the storage device
Floppy disk drive, CD or DVD drive, etc. Devices on Microsoft Windows are identified by name or letter a: device is floppy c: device is main disk drive Can be internal, external, or remote
When power to the device is shut off, data stored on the medium remains This is in contrast to RAM, which is volatile
Random access: data can be retrieved directly from any location on the storage medium, in any order Also called direct access Floppy and hard disk drive Sequential access: data can only be retrieved in the order in which it is physically stored on the medium Keyboard and tape drive
What you see in Windows Explorer File: something stored on a storage medium, such as a program, document, or image Filename: name given to a file by the user Folder: named place on a storage medium into which files can be stored Shortcut (Microsoft Windows): a file that is a link to another file (an "alias" for another file)
Data is stored magnetically; the data (0s and 1s) is represented using different magnetic alignments Floppy and hard disk
Data stored as optical marks made by laser beam CDs and DVDs
Data stored electronically Flash memory (called memory but in fact is storage)
Platters spin while data read or written
Removable storage medium no longer widely used Disk has only one slow-spinning platter
Main storage device on all PCs Disk has several fast-spinning platters
Only 1.44 MB capacity Very slow
Can buy external floppy drive and connect via USB
Heads move very quickly back and forth across platters to read and write data
Typically more than 5000 rpm The faster the spinning, the faster the data transfer
Depends on how fast the disk spins and how fast the read/write heads can move Typically about 10 ms (0.01 sec)
Greatly improves disk performance since data already in cache can be retrieved much faster RAM is on the motherboard or disk adapter card - not main memory
One disk could have c:, d:, and e: drives, for example
Installing more than one operating system Creating a recovery partition - restore system if main partition becomes unusable Creating separate partitions for programs and data
Partitions demo
Drive can be moved from one PC to another Good for backup purposes May be slower and less reliable than internal drive
Good for backup purposes Less capacity and more expensive