Hard Drive (HDD)
A hard drive is one of the most common storage devices we’ll find in our
computers, because they store such a large amount of data. There are a
lot of different kinds of hard drive formats , there is a SATA hard drive , PATA hard dive and a SCSI hard drive , they are storing and retrieving the same amount of data the big difference between them the interfaces that we use to access each one of these storage devices . You wouldn’t normally remove the cover of a hard drive because any type of dust is going to damage the drive itself.
Now let's look at what is inside a hard drive !
First you can see the platter, and usually there are multiple platters that are spinning. And they’re spinning around this spindle that’s in the middle, and they’re going at a very, very high rate of speed. You have this actuator on the hard drive that controls this arm, so that it can move back and forth. The platters themselves are spinning very, very quickly on hard drives that we might have at home. They might be at 7200 RPM (round per minute )and slower.
For enterprise environments, it’s very common to see hard drives that would run at 10,000, or even 15,000 rotations per minute. And as you can see by these latency numbers, the faster the spin, the faster you can get the data. As the drive goes a little bit slower to 7,200 and down to 4,800, you can see that your latency gets slower and slower.
We don’t have a spinning platter like we see in the picture above. Instead, there’s no platter at all. It is completely solid state. There’s no moving parts. It’s all memory inside of this device We simply will read and write memory. And it’s very, very fast in how it works. One of the challenges with this is that currently this is an emerging technology, and it still expensive !
Now let's look at what is inside a hard drive !
First you can see the platter, and usually there are multiple platters that are spinning. And they’re spinning around this spindle that’s in the middle, and they’re going at a very, very high rate of speed. You have this actuator on the hard drive that controls this arm, so that it can move back and forth. The platters themselves are spinning very, very quickly on hard drives that we might have at home. They might be at 7200 RPM (round per minute )and slower.
For enterprise environments, it’s very common to see hard drives that would run at 10,000, or even 15,000 rotations per minute. And as you can see by these latency numbers, the faster the spin, the faster you can get the data. As the drive goes a little bit slower to 7,200 and down to 4,800, you can see that your latency gets slower and slower.
Solid State Drive (SSD)
We don’t have a spinning platter like we see in the picture above. Instead, there’s no platter at all. It is completely solid state. There’s no moving parts. It’s all memory inside of this device We simply will read and write memory. And it’s very, very fast in how it works. One of the challenges with this is that currently this is an emerging technology, and it still expensive !
Optical Fomats
Another common type of storage media on our devices are optical formats.
We have everything from CD ROMs to DVD ROMs, to Blu-ray discs that we
use these days, but they all tend to work exactly the same way however every one of these has it 's own capacity of storage :
- CD (compact disc) : 700 MB capacity
- DVD (digital virsatil disc) : 4.7 GB for single layer and 8.5 GB for dual layer
- Blu-ray: 25 GB for single layer and 50 GB for dual layer
Removable storage-flash memory
Micro SD
Micro SD is used for storing digital information they are commonly used in many electronic devices like digital camera , mobile phones , laptop , mp3 player and video game consoles they are small and able to maintain data without power
USB flash drive
USB flash drives are typically removable and rewritable, and physically much smaller than a floppy disk , USB flash drives are often used for the same purposes for which floppy disks or CD-ROMs were used, i.e., for storage, back-up and transfer of computer files. They are smaller, faster
External removable HDDs
External removable HDDs typically connect via USB.Plug and Play drive functionality offers system compatibility, and features large storage options and portable design. their capacities generally range from 160GB to 2TB. Common sizes are 160GB, 250GB, 320GB, 500GB, 640GB, 750GB, 1TB, and 2TB
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GEEKINNERS ,WE ARE BEGINNERS !
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