Storage
by teerasan jan
1. Optical Discs
1.1. An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser
1.2. Typically store software, data, digital photos,movies, and music
1.3. Read only vs. rewritable
1.4. Optical discs commonly store items in a single track that spirals from the center of the disc to the edge
1.5. New node
2. Hard Disks
2.1. A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information
2.2. Characteristics of a hard disk
2.2.1. Capacity
2.2.2. Platters
2.2.3. Read/Write Heads
2.2.4. Cylinders
2.2.5. Sectors an Sectors an Tracks
2.2.6. Revolutions Revolutions per Minute
2.2.7. Transfer Rate
2.2.8. Access Time
2.3. A head crash occurs when a read/write head touches the surface of a platter
2.4. Always keep a backup of your hard disk
2.5. Formatting is the process of dividing the disk into tracks and sectors so that the operating system can store and locate data and information on the disk
2.6. RAID (redundant array of independent disks) is a group of two or more integrated hard disks
2.7. A network attached storage (NAS) device is a server connected to a network with the sole server connected to a network with the sole purpose of providing storage
2.8. A disk controller consists of a special‐purpose chip a electronic circuits that control the transfer of data, instructions, and information from a disk to and from system bus and other components of the computer
3. storage device
3.1. Reading is the process of transferring items from a storage medium into memory
3.2. Writing is the process of transferring items from memory to a storage medium
4. Access time
4.1. The amount of time it takes a storage device to locate an item on a storage medium storage medium
4.2. The time required to deliver an item from deliver an item from memory to the processor
5. Flash Memory Storage
5.1. Flash memory chips are a type of solid state media and contain no moving parts
5.2. Solid state drives (SSDs) have several advantages over magnetic hard disks
5.3. memory card
5.3.1. microSD
5.3.2. xD Picture Card
5.3.3. Memory Stick
5.3.4. Memory Stick Micro (M2)