Chapter 9 Optimizing and Protecting Hard Drives

Chapter 9 Optimizing and Protecting Hard Drives -...

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Optimizing and Protecting Hard Drives Chapter # 9 Amy Hissom Key Terms antivirus (AV) software — Utility programs that prevent infection or scan a system to detect and remove viruses. McAfee Associates’ VirusScan and Norton AntiVirus are two popular AV packages. backup — An extra copy of a file, used in the event that the original becomes damaged or destroyed. boot sector virus — An infectious program that can replace the boot program with a modified, infected version of the boot command utilities, often causing boot and data retrieval problems. buffer — A temporary memory area where data is kept before being written to a hard drive or sent to a printer, thus reducing the number of writes to the devices. chain — A group of clusters used to hold a single file. child, parent, grandparent backup method — A plan for backing up and reusing tapes or removable disks by rotating them each day (child), week (parent), and month (grandparent). cross-linked clusters — Errors caused when more than one file points to a cluster, and the files appear to share the same disk space, according to the file allocation table. defragment — To “optimize” or rewrite a file to a disk in one contiguous chain of clusters, thus speeding up data retrieval. differential backup — Backup method that backs up only files that have changed or have been created since the last full backup. When recovering data, only two backups are needed: the full backup and the last differential backup. disk cache — A method whereby recently retrieved data and adjacent data are read into memory in advance, anticipating the next CPU request. disk cloning See drive imaging. disk compression — Compressing data on a hard drive to allow more data to be written to the drive. disk imaging See drive imaging. drive imaging — Making an exact image of a hard drive, including partition information, boot sectors, operating system installation, and application software to replicate the hard drive on another system or recover from a hard drive crash. Also called disk cloning and disk imaging . DriveSpace — A Windows 9x utility that compresses files so that they take up less space on a disk drive, creating a single large file on the disk to hold all the compressed files. encrypting virus — A type of virus that transforms itself into a nonreplicating program in order to avoid detection. It transforms itself back into a replicating program in order to spread.
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file virus — A virus that inserts virus code into an executable program file and can spread whenever that program is executed. firewall — Hardware or software that protects a computer or network from unauthorized access. fragmentation
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Chapter 9 Optimizing and Protecting Hard Drives -...

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