Both devices provide non-volatile storage, which means they’re capable of storing data even when a computer loses power (as opposed to something like random access memory, which requires a constant source of electricity).
Hard disk drives (HDDs) use mechanical components to store data using magnets, while solid-state drives (SSDs) store data electronically. SSDs do not contain moving parts, which is advantageous for several reasons.
To understand the benefits of each technology, we need to understand how they function. It’s fascinating stuff, but skip over this next section if you simply want to review the advantages and disadvantages of each.
How Hard Drives WorkHard drives contain one or more platters, which are discs coated with a thin layer of magnetic material. As the platters spin, the head stack assembly—similar in appearance to a turntable stylus—reads and writes data as north or south magnetic charges. These charges appear to the computer as 0’s and 1’s (a system known as binary data). Each binary digit is called a bit.
Modern hard drives can store an incredible amount of data. A 1-terabyte hard drive contains 8 trillion bits. That’s a lot of zeros, and it means the surface of a hard drive’s platters are densely packed with information.
The hard drive’s read/write heads never actually touch the magnetic material; they float on a cushion of air generated by the spin of the platters. That cushion of air is incredibly small, about 5 to 10 nanometers. To put that in perspective, a human hair is about 90,000 nanometers in diameter.
If something goes wrong, the heads could come into contact with the platters, scraping off the magnetic material and physically removing data from the hard drive. That’s called a head crash, and it’s one of the most common sources of data loss. That’s where phrases like “my computer crashed" came from.
Modern hard drives have plenty of safeguards to prevent this type of catastrophic failure. Still, because they use moving parts, every hard drive eventually fails—the spindle that moves the platters could seize, the heads could become misaligned, or the circuit board that relays data to the rest of the computer could stop working.
HDD read/write speeds are also limited by the speed of their spindles. Typical computer hard drives spin at 7,200 rotations per minute or faster, but even so, to read a certain bit, the heads must physically move over that space on the platter.
How Solid-State Drives WorkAs their name implies, solid-state drives don’t rely on moving components to store data. They consist of NAND flash memory, which uses floating gate transistors to store data with electricity.
If that sounds complicated...well, it is, but the basic function is fairly simple. Basically, the floating gates register as a “0" when they hold an electric charge and as a “1" when they don’t hold a charge. The gates are organized into smaller pages and larger blocks.
Here’s the main drawback of the technology: SSDs can’t really modify data easily. To change a file, the drive needs to make a copy of an entire block, erase the first block, then rewrite it with the new data. Erasing a block of data requires a relatively large amount of voltage, so overwriting data is a complex process, and floating gates become less reliable as they’re overwritten multiple times.
What does that mean for your data? Eventually, your SSD will become slower, and data corruption will become more common. Modern SSDs have technology to limit this effect, but that’s outside the scope of this answer—the important point to keep in mind is that every type of long-term data storage device will eventually fail, so while solid-state drives are more reliable than traditional hard drives in some respects, they’re not perfect.
Should you use a hard drive or a solid-state drive?Both storage technologies have benefits. Depending on how you use your computer, you might prefer one type of storage.
Here are some of the advantages of each option:
Regardless of which storage device you choose, you should make sure you have a decent backup plan in place. Never trust a single device with all of your important data, and try to keep some free space on your HDD or SSD to allow it to function as efficiently as possible. If your computer seems much slower than normal, or if you hear sounds coming from a hard drive, back up important files immediately and replace your storage media.
While neither technology is perfect, they’re both capable of storing incredible amounts of information, and they’re both reliable options when used properly.
Normal hard drives, called hdd's work by using a rotating disk on which the computer's contents are stored. Solid state drives, or ssd's use flash memory and do not have moving parts. The benefits of ssd's are that they work much faster than hdd's and they don't wear out as quickly because nothing move inside them, one downside is that they are currently much more expensive than hdd's.
Strictly speaking, you are comparing a hard drive and a solid-state drive (SSD). The interface (SATA) is irrelevant to this question. The hard drive uses one or more platters coated with magnetic material. An arm moves a head over the platter(s) to read/write data. The solid-state drive has no moving parts. Instead, it uses logic gates and other circuitry to store data. Reading is done by sending a certain voltage to the desired cell (unit of storage), while writing is done by sending a larger voltage.
I honestly think that the hard-drive is better, because they typically have more storage than a solid-state-drive, but that is only my oppinion
the difference between channel and medium is that channel is the form how the message will be while medium is the actual message
Optical Storage Medium
dispersion medium is contained
dispersion medium is contained
The logical database is how the data is percieved in the tables, the way the data is actually stored on the storage medium is the physical view of the database.
CD's speed, size (amount of data it can hold) and the fact it is W.O.R.M., Write Once, Read Many vs W.M.R.M, Write Many, Read Many (Harddrive for example) are the major drawbacks for the CDRom as multimedia storage.
When undertaking a write operation the read/write head usually has to use more power during a write operation as this operation must effect a change of state in the storage medium. On the read operation the read/write head merely has to detect this changed state.
portable storage medium
The standard difference in widths is 1/8" . Therefore the difference between a AA and a medium (B) would be would 1/4".
a mean is the average the medium is the number in the midle of the ordered numbers
aaa
A storage device stores data onto a storage medium. For example a tape backup device writes data onto tape medium