STORAGE
by Lim Hui Zi
1. Cloud storage -keeps info in servers, internet -Provides storage to computer/mobile device over the Internet servers
2. VOLATILE (RAM)
2.1. -contents disappear when power is removed. -eg: screen display -Thus, it is not a storage -Yet, it can be said as memory
3. UNVOLATILE (ROM)
3.1. -contents still available when power is removed -slower than RAM but is cheaper
4. HARD DRIVES (HDD)
4.1. EXTERNAL HARD DRIVE
4.1.1. -Connected with cable to the USB port on device - Can be removed from device -eg: RAID (redundant array of independent disks)
4.2. HARD DISK DRIVE (HDD)
4.2.1. -contains platters that use magnetic particles to store data, instructions, and information -storage capacity determine by number of platters,composition of magnetic coating on platters, density and recording type (perpendicular/longitudinal)
4.3. SOLID STATE DRIVE (SSD)
4.3.1. -Flash memory storage device -Has own processor -Faster access times -Faster transfer rates -Quieter operation -More durable -Lighter weight -Less power consumption -Less heat generation -Longer life -Defragmentation not required
5. MAGNETIC STRIPE CARD
5.1. -has a magnetic stripe that contains information -eg: Credit/Debit card
6. SMART CARD
6.1. -stores data on an integrated circuit embedded in the card -TouchnGo
7. Storage medium -physical material to store data/app/info/program
7.1. capacity is counted in bytes -eg: KB, MB, GB
8. Storage device -hardware that records & retrieves items from storage medium
8.1. Included -writing (memory to storage) -Reading(storage to memory)
9. PORTABLE FLASH MEMORY STORAGE
9.1. -removable flash memory storage device that you insert and remove from a slot in a computer, mobile device, or card reader/writer -eg : pendrive, USB flash drive, memory card (SDHC, SDXC, miniSD, microSDHC)
10. OPTICAL DISCS
10.1. -flat, round, portable disc made of metal, plastic, and lacquer -Read/written by laser -commonly store items in a single track that spirals from center of disc to edge of disc
10.2. -CD-ROM/DVD-ROM (can read but can't write/erase) -CD-R/DVD-R/DVD+R (can write once but can't erase) -CD-RW/DVD-RW/DVD+RW (erasable multisession disc)
11. RFID tag
11.1. -consists of an antenna and a memory chip that contains the information to be transmitted via radio waves and can be read by RFID reader