Storage devices

1
Storage devices

• Bits, Bytes, Kilobytes, MB, GB, Terabytes
• Hardware
• Moores law
• Disks
• Internal hard disk 500 GB 2 TB (50-100 )
• External hard disk 500 GB 2 TB (50-100 )
• Solid State Drive SSD 60 GB 500 GB (50-300 )

2
Storage devices

• Discs
• CD 700 MB and DVD 4 GB ( 1 )
• Single use R or rewritable RW
• Need a writer to be written
• Blu-ray 25 GB ( 5 )

3
Storage devices

• Memory
• USB pen drive or memory stick
• 4-64 GB (5-80 )
• Used mostly to move data
• Memory cards
• Camera, phones, players

4
Software

• Software types
• Operating system
• Takes care of devices
• User-computer interface
• Windows OS X Linux
• Android iOS Windows Phone
• Program files (Word, Excel, Skype, )
• Data files

5
Software licenses

• Cost
• Freeware (Skype Linux)
• Shareware (mobile phone apps)
• Commercial (Windows Photoshop)
• Subscription (Office 365)
• Private
• Permission to modify
• Free or Open Source (Linux)
• Proprietary (Acrobat Reader WinZip Office)

6
Software naming

• Name
• Linux, Microsoft Office, Microsoft Windows
• Distribution/edition
• Linux Ubuntu
• Microsoft Office Professional
• Microsoft Windows Enterprise
• Version (usually numeric but may be a name)
• Linux Ubuntu 13.10
• Microsoft Office Professional 2013
• Microsoft Windows 7 Enterprise

7
Data format

• Open
• GIF, PDF, HTML
• Closed proprietary
• DOC
• Open proprietary
• DOCX