HDD storage is made of magnetic tape and contain mechanical parts inside. They're larger than SSDs and much slower to read and write. Where as an SSD (solid state drive)is flash storage and has no moving parts whatsoever. they're smaller and take up less space in a PC case,
If you want speed,then go for SSD because they are very fast at transfering the files,or booting up the operating system.If you only have HDD storage in your machine, then Windows will take longer to boot up, applications will take longer to load, and files will take longer to open and save.
From my experience One of the best use for an SSD in a PC is as a boot drive. This means installing a small capacity drive on which your Windows 10 operating system will live and boot up from every day.
The lifesp of an SSD isn't long but you can certainly use an SSD as your only drive in a PC.The best case for HDD is mass storage. HDD are cheaper than SSD,so you can store massive amount of data in your HDD
An efficient system would have an SSD to boot Windows from and one or more HDDs for mass storage.
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