1. Hard Drives
A hard disk drive is a hardware device that's used to store
information like software and files. The primary hard disk
in a PC is often called the C drive.
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2. Storage Systems
• Hard Drives
– 2 Types: SCSI and IDE
• IDE drives-
– originally developed as alternative to more expensive SCSI
drives.
– Modern versions called EIDE drives.
– Support up to 4 multigigabyte drives.
– If you want more devices, use SCSI or USB
– Low-level formatted at the factory

3. Hard Drive

4. How Data is Organized on Hard Drive Disk
• Tracks-
– circular areas of the disk
– Length of a track one circumference of disk
– Over 1000 on a hard disk
– Data first written to outer most track
• Sectors-
– Divides tracks sections
– On a floppy 9 sectors exits
• Cylinders-
– Logical groupings of the the same track on each disk surface in a disk
unit
• Clusters-
– Groups of sectors used by operating system
– 64 sectors in one cluster

5. Tracks and sectors
Can store
512 bytes
Sector = Track=
small arc concentric
of track circle

6. Backing up data
• Archival: full backup- contains everything
from the hard disk
• Incremental: contains only files that have been
modified since last (previous) backup
• Differential: backs up all the data modified
since last full backup
• Copy backup: copy duplicate of file, directory,
or disk to another disk

7. Backing up data
• Archival: full backup- contains everything
from the hard disk
• Incremental: contains only files that have been
modified since last (previous) backup
• Differential: backs up all the data modified
since last full backup
• Copy backup: copy duplicate of file, directory,
or disk to another disk