why static memory is not used instead of mechanical hard drives?

Question

computers are very slow , in my opinion due to mechanical hard drives.
What are the practical reasons that manufacturers are not using static memory which have no moving parts.

Answer 1

COST.

Let's compare.

Take this A-DATA 16GB Compact Flash (CF) Flash Card Model SPEEDY CF 16GB for $159.99. That's $10 per GB.

Then look at this awesome hard drive: HITACHI Deskstar T7K250 HDT722525DLA380 (0A31636) 250GB 7200 RPM 8MB $64.99 That's 25 cents per GB.

So if you wanted a 250GB Flash hard drive, it would cost $2500.

SPEED:

The write-speed of Flash is very slow. I worked on a project spec once that used a drive controller that would write to parallel sets of FLASH memory at the same time. We determined that we need 16 parallel sets of flash devices to reach hard drive speeds. This system was going to be very expensive, but our goal was to provide electronic memory that could store video data that could survive an airplane crash (in a so-called Black Box). Using striping and RAID techniques, even a partial failure could help to retain most of the video sequencing.

In fact, the whole idea of RAID, is so that you can use TWO really cheap hard drives and not worry about minute to minute backups.

Good luck and Happy Computing!

Answer 2

becasue it is expensive. You can get a 32gb solid state hard drive for $500 when u can get a 200gb mechanical drive 4 way less