Desktop PC + SSD = UPS

SSD (Solid State Disk) devices are becoming very popular and are slowly replacing traditional hard disk drives, particularly in notebook devices. While the SSDs are fast, lightweight and quiet, they are still relatively expensive, although cost per GB of storage continues to get better.

There are some requirements for the care and feeding of such drives, though; defragmenting is not recommended (modern versions of Windows will adjust accordingly), and the drives have a finite number of read/write cycles - i.e. they will wear out over time. You can mitigate that by avoiding running your SSD drive near to capacity all the time (leave at least 20% free space if possible).

It has also been established that SSD drives do not do well if the power is interrupted - it's not so much file system corruption (as may happen to a traditional hard drive under such conditions), but rather physical damage to the device itself - even in high-end "enterprise" devices.

In a laptop computer this would be less likely, because they can run from battery power, and will power off or hibernate before the battery completely drains.

With a desktop computer, it makes a great case for using an inexpensive UPS (Uninterruptible Power Supply) to protect your data. A UPS will start beeping like crazy when the AC power to it goes out, but its internal battery will allow you a reasonable amount of time (10 mins or more) to shut down the computer properly and avoid potentially damaging something - particularly the SSD.

They also isolate the computer from electrical brown-outs and power surges - always  a good idea.

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