HDD - Hard Disk Drive - A mechanical Drive with multiple platters storing your data.
FDD - Floppy Disk Drive - Magnetic Disk maximum storage of 1.44 MB
UFD - Universal Flash Drive - This can be a normal USB
SSD - Solid State Drive - Special Flash Storage called NAND, very fast but expensive (More reliable and less power consumption)
SSHD - Solid State Hybrid Drive - Typically like HDD but has a flash based cache. Still the same speed of a HDD. You don't see much difference in the naked eye.
O/D - Optical Drive - CD, DVD, Blu-ray.
External Hard Drive - Like HDD with mechanical drive but its portable and can be connected via USB 2.0 and USB 3.0 or eSATA. It won't as fast as a Internal Hard Drive because of SATA connector.
Desktop Drive - External Drive needs power from the power socket.
Portable Drive - External Drive can be USB Charged.
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