SSD (solid-state drive)SSD
Solid State Drives (SSDs) have become much more common in recent years. They’re standard issue across Apple’s laptop line, for example the MacBook, MacBook Pro and MacBook Air all come standard with SSDs. So does the Mac Pro.
Inside an SSDSolid state is industry shorthand for an integrated circuit, and that’s the key difference between an SSD and a HDD: there are no moving parts inside an SSD. Rather than using disks, motors and read/write heads, SSDs use flash memory instead — that is, computer chips that retain their information even when the power is turned off.
SSDs work in principle the same way the storage on your smartphone or tablet works. But the SSDs you find in today’s Macs and PCs work faster than the storage in your mobile device.
The mechanical nature of HDDs limits their overall performance. Hard drive makers work tirelessly to improve data transfer speeds and reduce latency and idle time, but there’s a finite amount they can do. SSDs provide a huge performance advantage over hard drives — they’re faster to start up, faster to shut down, and faster to transfer data
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