1 7 Systems software Recap Title Operating System

1. 7: Systems software Recap

Title: Operating System & Utility Software Date: 1. Name me one function of an operating system (OS) 2. What is encryption? 3. Complete a binary shift right 2 places 01110011 4. Convert the following into either Binary or Denary 01110011 and 67

• Feedback SA User Interface – The OS provides a means of interacting with the computer • Peripheral management and drivers - devices connected externally to the CPU includes keyboards ect • File management - allows the OS to use files • Memory management and multitasking –moves programs and files in and out of memory (Hard drive) • User management –users have username and password. Each user can be granted different levels of access Encryption is the process of encoding data so that it cannot be easily understood if it is discovered, stolen or intercepted. 115 & 01000011100

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Defragmentation software When a file is stored on a hard disk it is stored as a series of segments. Sometimes the segments run together in sequence (see File 1) and sometimes the segments are split up over a disk (see File 3). This is known as fragmentation. Over time, more files become fragmented, as do individual files. A fragmented disk takes longer to read from and write to, making a computer run slower.

Defragmentation software takes the fragmented files and rearranges the segments so that they run together. This decreases read/write time, thereby speeding up computer performance.

Utility Encryption Definition Purpose Example Encryption is converting a file from a readable form to an encoded version that is only readable if decoded using a key / password. Encryption is used to secure data that you don’t want anyone else to access or read. Encryption is used for online purchases when submitting bank account details. This is to make sure that other people can not read the details and therefore steal money.

Time : 35 minutes Utility Encryption Defragmentation Data compression File Backup Title : Utility Systems Software Definition Purpose Example

Utility Definition Purpose Example Encryption is converting a file from a readable form to an encoded version that is only readable if decoded using a key / password. Encryption is used to secure data that you don’t want anyone else to access or read. Encryption is used for online purchases when submitting bank account details. This is to make sure that other people can not read the details and therefore steal money. Defragmentation Where you clean up your hard drive to make the files easier to access Process speeds up the computers file retrieval and storage times Data Compression Compressing files so that they are smaller and take up less space in storage Compression software reduces the size of a file stored on secondary storage. Compressing a photo to a smaller size to save storage space A copy of data is known as a backup. Backups can contain a copy of all files on a computer, or just ones specified by a user. To prevent data loss, regular copies of the data should be made. Full backup Copies every file (longer to do, takes up more space) Encryption File Backup Incremental backup Only copies new files (takes less time, less space)

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Use the words: deleted, fragmented, moved, files, edited, extension, renamed

Feedback SA Files Extension Moved, edited , deleted Renamed. fragmented