Digital Storage

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Digital Storage by Mind Map: Digital Storage

1. Cloud storage

1.1. keeps information on servers on internet

1.2. an internet service that provides storage to a computer or mobile

2. types of cloud storage

2.1. (a) Optical disc - consists of flat,round, portable disc made of metal,plastic and lacquer that is written and read by a laser.

2.1.1. -commonly stores items in a single track that spirals from center to the edge

2.1.2. track is divided into even sized sectors

2.1.3. Types of optical disc CD-ROM CD-R CD-RW

2.2. (b) Enterprise storage - allows large organizations to manage and store data,info using devices intended for heavy use, and maximum efficiency and maximum availability

2.2.1. Types of enterprise storage Network attached storage (NAS) server placed on a network w sole purpose of providing storage to users,computers,devices attached. Storage area network ( SAN) - a high speed network w sole purpose of providing storage to other attached servers.

3. Local storage

3.1. physical material where computer keep data, information,programs and applications

4. Storage device

4.1. a hardware that records and/or retrieves items to and from storage media

4.2. reading process

4.2.1. a process of transferring items from storage medium into memory

4.3. writing process

4.3.1. a process of transferring items from memory to a storage medium

5. Access time measures

5.1. amount of time taken of a storage device to locate an item on a storage medium

5.2. time taken to deliver item from memory to the processor

6. Types of storage

6.1. Hard Disc (HARD DISC DRIVE)

6.1.1. storage capacity

6.1.2. determined by: (a)number of platter the disc contains (b) composition of magnetic coating on platter (c) density

6.1.3. Characteristics - tracks , sectors, platter,reduction per minute

6.2. SSD( solid state drive)

6.2.1. a flash memory that contains its own processor for storage management Advantages over traditional hard discs(magnetic) -fast access time, fast transfer rates, less power consumption, less heat generation, durable,light weight.

6.3. External hard drive

6.3.1. separate freestanding storage device that connects w a cable to a USB port

6.4. RAID (redundant array if independent disc)

6.4.1. a group two or more integrated drives

6.5. Memory Card

6.5.1. removable flash memory storage device that is inserted and removed from a slot in mobile, computer,card reader.