1 / 7

Storage

Storage. Secondary Storage. Computer Storage. Computers have two kinds of storage: Primary Storage Secondary Storage Primary storage is also called memory. Secondary storage is often called storage. Individuals often do not distinguish between these two types of computer storage.

dusty
Télécharger la présentation

Storage

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Storage Secondary Storage

  2. Computer Storage • Computers have two kinds of storage: • Primary Storage • Secondary Storage • Primary storage is also called memory. • Secondary storage is often called storage. • Individuals often do not distinguish between these two types of computer storage.

  3. Secondary Storage • Unlike memory storage is NOT volatile, so its contents last even when the power is turned off.

  4. Storage Technology • Magnetic • Hard drives, floppy drives • Optical • CD/DVD drives/burners • Integrated Circuit (IC) • Flash memory (USB sticks) • Flash memory (SD,CF, etc [camera memory] • SSD (solid state drive) modern hard drives for some notebook computers which can also be used in desktop computers.

  5. Magnetic Storage • Hard (Fixed) disk is the most common kind. Virtually every computer has a hard disk. External hard disks are also available. • Platters/Surfaces • Tracks • Sectors • Disk blocks/clusters • Approximate Costs: • Internal 1000GB = $80 ( 8cents / gb) • External 1000GB = $90 (USB only)

  6. Optical Storage • One spiraling track from center to outside. • Compatible with standard CDs and DVDs. • Currently CD only drives are scarce but DVD drives are compatible with CD drives. • Blu-ray drives are downward compatible but are not as popular because of DRM concerns. • Approximate Costs: • Internal Drive ~ $20/ Internal burner ~ $25 • External Drive ~$35 /External burner ~ $40-50 • Internal Blu Drive ~$60-75 / Burner ~ $100 • External Blu: $100 / Burner ~ $150 or so

  7. IC storage • No moving parts • Therefore speed is faster than either optical or magnetic • Breaks down after lots of use (normally measured in the 100s of thousands of times. • Approximate Costs: • USB stick: • SD card: $1-2 per gb for medium sizes 8gb=12, 32gb= 50, 64gb= 150 128gb=1100 • SSD drive: about $2/gb

More Related