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 Optical Integrated Circuit (IC)
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= gb=1100
SSD drive: about $2/gb