Q.What are the advantages of SSDs?
There are five major advantages of SSDs.
First, SSDs are very fast, especially when compared to HDDs.
The difference comes from how the drives work.
Whereas HDDs read and write data with mechanical movements of its parts such as the motor and the magnetic disk, SSDs use the electric signals of semiconductors.
Second, SSDs dissipate less heat, consume less power, make less noise, and weigh less.
Using electric signals rather than moving parts, SSDs produce neither much heat nor noise.
They only consume 20% as much power as HDDs and weigh less.
Third, SSDs are shock-resistant.
Unlike an HDD that contains mechanically moving parts, an SSD is made up of memory chips and thus more resistant to shocks.
Fourth, SSDs do not need to be defragmented.
Instead of finding data mechanically as HDDs do, the data stored on the memory chip of an SSD is read using electric signals, which means there is no need for defragmentation.
Fifth, SSDs are heat-resistant.
SSDs can run within the range of 0 to 77 ℃, which means they can endure higher temperatures than HDDs can.
Q.What does reading mean in SSD terms?
Reading refers to retrieving data from a storage device or a memory chip in an SSD.
An example of reading is retrieving stored documents.
Q.What is the read speed of a SSD?
The read speed of a SSD is measured separately for sequential read and random read.
The sequential read speed refers to the speed of data input and output when a SSD reads large blocks of data.
In contrast, the random read speed is the speed of data input and output when a SSD reads smaller blocks of data.
As many users primarily use their computers for reading data, they prefer faster read speeds.
Q.What are the units of sequential read/write and random read/write?
Sequential read/write speeds are measured in MB/s (Mega Bytes per Second), whereas random read/write speeds are measured in IOPS (Input/output Operations per Second).
Both units represent the amount of data input and output that can be processed in a second, and therefore larger numbers indicate higher speeds.
A sequential write speed is measured in MB/s, and a random write speed is measured in IOPS, and in both cases, larger numbers indicate better performance.
Q.What is the write speed of a SSD?
The write speed of a SSD is measured separately for sequential write and random write.
The sequential write speed refers to the speed of storing large blocks of data such as when installing videos or programs of large size.
In contrast, the random write speed is the speed of storing small blocks of data, and it affects the speed of PC booting and program running.
Booting a PC and running a program both require a large number of small files.
Therefore, it’s better to use a SSD with a fast random write speed for these commands.
Q.How long is the lifespan of a SSD?
The lifespan of a SSD varies, depending on the computing environment.
The meantime between failures, MTBF, of a SSD is between 1.2 - 1.5 million hours.
Q.What is the TBW of a SSD?
TBW stands for terabytes written, which represents the lifespan of a SSD.
The lifespan is determined by how much data can be written to the SSD (i.e. data storage).
The TBW represents the total write endurance of a SSD throughout its lifespan.
For instance, 72TBW means 72TB of data can be written, which equals writing 50GB daily for four years.
(72TB = 72,000GB= 4 years X 365 days X approximately 50GB)
Q.What is MTBF?
MTBF stands for meantime between failures, which is the average time between data failures.
In other words, it means the average time between one data error and the next in an HDD or an SSD.
Q.What is wear leveling?
The NAND flash memory component of a SSD stores data.
Wear leveling is a technique that prolongs the lifespan of the NAND flash memory by avoiding writing (i.e. storing data) in the same blocks repetitively and instead storing data in less heavily used locations.
This technique allows the NAND flash memory to evenly use all data blocks, thereby increasing the lifespan of a SSD.
Q.What is a SSD interface?
The interface of a SSD is a point of connection between two systems or devices.
The term is used for both hardware and software.
A SSD interface is the hardware and software connection between a PC and a SSD.
A hardware interface is sometimes used interchangeably with the term form factor, meaning the size and the shape of the component that physically connects to a device.