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SPEED (and MEASUREMENT):  Here are some useful speed and measurement figures.  These numbers are as accurate as possible, but are recited mainly for COMPARISON and ESTIMATION purposes, i.e. how much faster one type of connection would be over another.   BEWARE:  All numbers are “theoretical” and are estimates - for calculating practical usage, divide by as much as half!

Definition links are highlighted in BLUE.

Wireless Transfer Speeds:

80211b - 11Mbps

80211g - 54Mbps

80211n - 300 Mbps

802.11ac - 1.3 Gbps

Cable Transfer Speeds:

POTS (TEL) - 52Kbps

56L V90, 92 Tel Modem - 56kbps

Mobile Phone - 14.4Kbps or more

DSL - 128Kbps or more

ISDN - 64kbps

Cable Broadband - 128Kbps or more

ethernet - 10/100Mbps

gigabit ethernet - 1000Mbps

USB:

    USB1 - 1.5Mbps

    USB2 - 12Mbps

    High Speed USB2 - 480Mbps

    USB 3 - 34.8Gbps

Serial - 9600bps

Parallel/Centronics - 4Mbps

Bluetooth 1.1 - 1Mbps

Bluetooth 2.0+EDR - 4Mpbs

Wi-Fi - 240Mpbs

WiMax - 75bps

Firewire 1 - 400Mbps

Firewire 2 - 800Mbps

Thunderbolt - 10Gbps

USB vs. FIREWIRE vs. THUNDERBOLT

IDE - 60Mbps

SATA -

    Rev. 1 - 1.5Gbps

    Rev. 2 - 3Gbps

    Rev. 3 - 6Gbps

    Express - 8Gbps - 16Gbps

SATA and IDE compared

SCSI 5-80Mhz, depending on bus speed

PCI - 32 bit/66Mhz - 2133Mbps

PCI Express - 2000Mbps or more

Memory Measurement Units:

bit = 1 unit

byte = 8 bits

megabyte = 1024bytes

gigabyte = 1024 megabytes

terabyte = 1024 gigabytes

Storage Media:

3” Floppy - 1.44Mb

CD - 700Mb

DVD - 4.7Gb, 7.0Gb

Travan Tape - 120Mb

Zip - 100Mb

Jazz - 250Mb

Compaq Flash1 - up to 512Mb or more

Flash 2 - Up to 8Gb or more

USB - 4Gb  - 64Gb or more

Disk Read Speeds:

Desktop - 7200rpm, 9ms seek

Laptop - 5400, 5ms seek

Enterprise - 10-15,000rpm, 4.5ms seek

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