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Storage devices Bits, Bytes, Kilobytes, MB, GB, Terabytes

Hardware Moore’s law

Disks Internal hard disk 1 - 2 TB (50-100 €) External hard disk 1 - 2 TB (50-100 €) Solid State Drive SSD up to 500 GB (up to

300 €)

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Storage devices

Discs CD 700 MB DVD 4 GB Blu-ray 25 GB

Need a reader to be read Need a writer to be written Large and easy to scratch

OLDTECH

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Storage devices

Memory USB pen drive or memory stick

up to 128 GB (5-80 €) Used mostly to move data

Memory cards Camera, phones

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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

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Software licenses Cost

Freeware (Skype; Linux) Shareware (mobile phone apps) Commercial (Windows; Office; Photoshop) Subscription (Office 365; Photoshop CC) Private

Permission to modify Free or Open Source (Linux) Proprietary (Acrobat Reader; WinZip;

Office)

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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

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Data format Open

GIF, PDF, HTML Closed proprietary

DOC Open proprietary

DOCX