Storage Devices

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Storage Devices by Mind Map: Storage Devices

1. Primary

1.1. ROM

1.1.1. Advantages: >>cannot be accidently changed >>perminant

1.1.2. Disadvantages: >>one created cannot be changed >>cannot be altered

1.2. RAM

1.2.1. Advantages: >>silent >>enery efficient

1.2.2. Disadvantages: >>risk of losing data when power goes out >>long loading time for opening OS

2. Secondary

2.1. Magnetic Storage

2.1.1. Definition: uses different patterns of magnetisation in a magnetisable material to store data and is a form of non-volatile memory. Fixed Hard Drive Advantages: >>fast read/write times >>huge capacities Disadvantages: >>damaged easily >>not portable Definition: Main method of storing data, because all computers have one. Definition: Used on all computers and are the main method of storing data. Portable Hard Drive Advantages: >>fast read/write >>huge capacities Disadvantages: >>easy to misplace/steal >>expensive Definition: works similar to fixed hard disks but are connected externally Definition: works in a similar way to fixed hard discs but are conencted to the computer externally Floppy Disk Advantages: >>Cost very little >>easy to carry around Disadvantages: >>low storage capacity >>few computers have floppy disc drives Definition: old method of portable data storage where information is help onto a thin plastic disc Definition: old method of portable data storage where information is held on a thin plastic disc. Magnetic Tape Advantages: >>less expensive >>very robust Disadvantages: >>needs another tape to update data >> very slow data access/transfer Definition: Oldest form of data storage, it is a thin strip of magnetic coated plastic which is wrapped onto a reel Definition: oldest form of computer data storage. It is a thin strip of magnetic coated plastic which is wrapped onto a reel.

2.2. Optical Storage

2.2.1. Definition: All the mediums that use a light source to read/write data onto a disc CD/DVD-ROM Advantages: >>holds more data than floppy disc >>less expensive than hard disc drive Disadvantages: >>less data than hard disc drive >>slow data transfer and access rates Definition: cannot be written over, and is already pre-loaded eg. movies, music, software, games Definition: are bought with pre-loaded data on them eg movies, software, music... CD/DVD-R Advantages: >>impossible to accidently delete >>cheap Disadvantages: >>only recordable once >>error may occur during burning of the disc Definition: recordable one only and cannot erased once there. Definition: the disc can be record-able once only. CD/DVD-RW Advantages: >>reuseable >>can be updated Disadvantages: >>more expensive accidently overwrite data Definition: re-writable, can be recorded on over and over Definition: re-writable, so it can recorded on over and over. DVD-RAM Advantages: >>long life >>very fast Disadvantages: >>expensive >>doesn't work in as many devices Definition: writing and reading of data can happen at the same time Definition: can write and read data at the same time Blu-ray Disk Advantages: >>huge storage >>transferred very fast Disadvantages: >>very expensive >>only works in blu-ray drives Definition: laser used to read the data is blue rather than red Definition: work in a similar way to DVD ROMs but the laser used to read the data is blue rather than red

2.3. Solid Storage

2.3.1. Definition: Any memory device with no moving parts and are based on electronic circuits Solid State Hard Drive Advantages: >>lasts longer >>faster Disadvantages: >> more expensive than magnetic hard disks >>smaller storage capacity than magnetic hard disks Definition: instead of magnetic hard disk drives, and have no moving parts Memory Stick Advantages: >>Small and lightweight >>robust Disadvantages: >>no write-protect feature >>easy to lose Definition: small, portable devices that can easily transfer data between computers. (miscro) Flash Memory Card Advantages: >>easy to transport >>robust Disadvantages: >>expensive >>easy to lose Definition: small rectangular shape and are usually used in phones (sims) and cameras