by 
The Curious Bag
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<h4 class="dechead">On One Hand: Laptop Drives Cost More
Laptop hard drives can cost up to twice as much as a desktop hard drive for an equivalent amount of storage space. Because of their smaller form factor, laptop drives have lower performance specifications and the maximum drive size available is often smaller.
On the Other: Laptop Drives are More Efficient
Laptop hard drives need less power for them to work, so if your system is already pushing the power supply to its limits, a laptop drive could be an efficient addition. Since they take up less space and weigh less than desktop drives, laptop drives work well for the small form factor cases and systems that are designed to be portable.
Bottom Line
Laptop drives can be used in a desktop PC as a second drive. Adapters may be needed to connect the laptop drive to the desktop PC. Unless there is a specific need or there is a spare drive already available, desktop drives are the better choice.
Source:
seagate.com: How to Install and Troubleshoot SATA Hard Drives
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