It’s all well and good to have a handle on how SSDs work, it’s more helpful to compare them to the traditional hard drives you’ve been using for years now. Let’s look at a few key differences in a point-by-point comparison.
Spin-up Time: SSDs have no spin up time, since the drive has no moving parts. HDDs have varying spin up times—usually a few seconds—when you hear a click-whirrrrrr for a moment or two when booting your computer or accessing an infrequently-used drive.
Data Access Time and Latency: SSDs are lighting fast and generally seek on an order of 80-100 times faster than HDDs. By skipping the mechanical spin and seek routine, SSDs access data almost instantly wherever it is on the disk. HDDs are hampered by the physical movement of the armature and the spinning of the platters.
Noise: SSDs are silent; no moving parts means no noise. HDDs range from pretty-darn-quiet to very-clumsy-click-beetle levels of sound.
Reliability: Individual manufacturing issues aside (bad drives, firmware issues, etc.), SSD drives come out ahead in the physical reliability department. The vast majority of HDD failures are a result of mechanical failure. At some point, after tens of thousands of hours of operation, a mechanical drive will simply wear out. In terms of read/write life, however, HDDs win (there is no write limit on a magnetic disk, you can change the polarity and indefinite number of times).
Conversely, SSDs have a finite number of write cycles. This limited-write-cycle issue is much trumpeted by people decrying SSDs, but the reality is that the average computer user would be hard pressed to hit the ceiling of read-write cycles on a SSD. Modern SSDs like the Samsung EVO 850 (one of the more popular SSD lines), for example, can handle hundreds of TiBs of data written over a few decades of use—more use than most people will put a drive to.
Additionally, SSD drives have a pretty neat-o feature; when the sectors of the NAND modules reach the end of their write-cycle, they become read only. The drive then reads the data from the failed sector and rewrites it to a new portion of the disk. This typically gives you plenty of time to backup your data and procure a new drive.
Power Consumption: SSD drives consume 30-60% less energy than traditional HDDs. Saving an odd 6 or 10 watts here and there doesn’t seem like a lot, but over the course of a year or two on a heavily used machine, it adds up.
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