When a read-write head makes contact with the hard disks surface, it causes a head
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Hard-disk It is composed of metallic disk. Hard-disk store and organize files using tracks, sectors, and cylinders.
Head crush of hard-disk Hard-disk is a sensitive instruments. It is easily lead to head crush that may caused by smoke particle, fingerprint, dust, or human hair. It is disastrous case for hard-disk. Head crush occurs when read-write head makes contact with the hard disk’s surface or with particles on its surface. This may cause the data destroyed or loss. Two types of hard disks 1. Internal Hard Disk As "internal" means, this kind of hard-disk is located inside the system unit. Commonly, we know it as C: drive. It is used for storing the operating system, large data files and other programs. It should keep routine maintenance and periodically backup all important files by users. 2. External Hard Disks As "external" means, it is removable hard-disk. It is used to complement internal hard disk with an unlimited amount of additional storage. Commonly, it is connect to a USB or FireWire port. Performance Enhancements of hard-disk 1. Disk caching
2. Redundant arrays of inexpensive disks (RAID)
3. File compression and decompression
Optical Disks
Three types of optical disks 1. Compact Disc (CD) - Standard on most computers, can store from 650 MB up to 1 GB a. Read only: CD-ROM
b. CD-R (CD-recordable)
c. CD-RW
2. Digital Versatile Discs (DVD) - Capacity of 4.7 GB to 17 GB a. DVD-ROM (Read only) b. DVD+R and DVD-R (Write once) c. DVD+RW, DVD-RW, and DVD-RAM (Rewriteable) 3. Blu-ray Disc (BD)
Solid-state Storage
Mass Storage Devices
- File servers – very large storage capacities that provide user access to fast storage and retrieval of data - Network attached storage (NAS) – function similar to file server but less expensive than file server - RAID systems – constantly backup copies of files moving across the organization’s networks (organizational security) - Tape library – device that provides automatic access to data archived on a large collection or library of tapes - Organizational cloud storage – high speed internet connection (remote organizational cloud storage server) Storage Area Network
Updated on 16 December 2018, 12:58 PM; 605 page visits from 9 December 2018 to 22 November 2022 What occurs when a read/write head makes contact with the hard disks surface or with particles on its surface?A head crash is a hard-disk failure that occurs when a read–write head of a hard disk drive makes contact with its rotating platter, slashing its surface and permanently damaging its magnetic media.
What is the physical material that holds data and programs?A storage medium is the physical material on which a computer keeps data, instructions, and information. Examples: Hard disks, solid state drives, memory cards, USB flash drives, ExpressCard modules, optical discs, smart cards, magnetic stripe cards, and microfilm.
What improve hardDisk caching—(provides a temporary high-speed holding area between a secondary storage device and the CPU; improves performance by anticipating data needs and reducing time to access data from secondary storage.)
What measures how tightly the magnetic charges can be packed next to one another on the disk?sectors. Measures how tightly the magnetic charges can be packed next to one another on the disk.
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