1. Storage, Multimedia and File Organization CIS 105

5. Cost and Speed

6. Formatting Formatting is the process of preparing a disk, hard disk, or CD for reading or writing. Formatting organizes the disk into storage locations called tracks ( a band that forms a circle on the disk). Formatting breaks the tracks into sectors which are small pie-shaped areas. Data stored in sectors must be retrieved for use and placed in memory. The time required to access and retrieve data is called access time . Tracks Sectors (Cluster: 2-8 sectors)

7. Care of Floppy Disks

9. RAID (Redundant Array of Independent Disks) Can be Combined (RAID LEVEL 0)

13. Disk Terms Superdisk, Zip, USB Flash High Capacity Portable Disks/Drives Small opening in floppy disk with tab to slide to cover/expose notch; indicates whether info can be written to disk Write protect notch Table of info used to locate files on a disk FAT (File Allocation Table) # sides (2) x tracks (80) x sectors/track (18) x 512 (bytes/sector) = 1.44MB Density 2-8 sectors; smallest unit of space to store data Cluster Pie-shaped arcs making up track. 512 bytes; Sector Narrow recording band; forms circle on disk surface Track Process of preparing disk by organizing into locations (tracks/sectors) Formatting Portable, inexpensive, 3.5” Floppy disk/diskette

15. Trivia Storage vs Memory? 3 Types of RAID? Storage Strategies? Temporary vs future; Speed Enterprise Storage Systems Data Warehouse Mirrored Striped Combination

23. Questions? ? ? ? ? ?