In its simplest form, an SSD is flash storage and has no moving parts whatsoever. As a result, they’re smaller and take up less space in a PC case, in some instances even mounting directly to the motherboard. SSD storage is much faster than its HDD equivalent.
HDD storage is made up of magnetic tape and has mechanical parts inside. They’re larger than SSDs and much slower to read and write.
HDDs are very common in desktops or laptops since they offer affordable and reliable storage. The two most common form factors are 2.5-inch (common for laptops) and 3.5-inch (common for desktop machines). The standardized size makes it easy to repair and replace when things go wrong.
The vast majority of hard drives in use today connect via a standard interface – SATA or Serial ATA. Sometimes some specialized storage systems use Fibre Channel, Serial Attached SCSI (SAS) or other interfaces for special purposes.
Many SSD makers produce SSDs that are designed to be plug-and-play drop-in replacements for 2.5-inch and 3.5-inch hard drives. Besides, it can also be installed in a PCle expansion slot, or even be mounted directly on the motherboard. This configuration is now common in high-end laptops and all-in-ones.
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Thanks Yosef.