The technology behind HDD drives dates back to 1954. And even while it has been considerably refined through the years, it’s even now can’t stand up to the revolutionary technology behind SSD drives. Through today’s HDD drives, the highest data access rate you can actually attain may differ in between 5 and 8 milliseconds.

With an HDD drive, the I/O performance gradually increases the more you employ the drive. Nevertheless, in the past it extends to a specific limit, it can’t go faster. And because of the now–old concept, that I/O restriction is significantly lower than what you can find with an SSD.

HDD can only go as much as 400 IO’s per second.

For an HDD drive to operate, it has to rotate 2 metal disks at more than 7200 rpm, holding them magnetically stable in the air. There is a large amount of moving components, motors, magnets along with other gadgets packed in a tiny space. Consequently it’s no wonder that the standard rate of failure of any HDD drive ranges somewhere between 2% and 5%.

From the moment they have been constructed, HDDs have been very electric power–heavy products. So when you have a web server with lots of HDD drives, this tends to add to the regular monthly electricity bill.

Normally, HDDs use up somewhere between 6 and 15 watts.

When you use an HDD, you will have to dedicate extra time waiting for the outcome of one’s file call. As a result the CPU will continue to be idle for additional time, waiting around for the HDD to reply.

The regular I/O delay for HDD drives is around 7%.

Sticking with the same server, however this time furnished with HDDs, the end results were totally different. The standard service time for an I/O query fluctuated somewhere between 400 and 500 ms.

On the other hand, on a server with HDD drives, a comparable back up takes 3 to 4 times as long in order to complete. A complete back–up of any HDD–equipped web server often takes 20 to 24 hours.