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Solid state drives (SSD) are a modern alternative to standard hard disk drives. Their main advantages include higher speeds, low power consumption and increased resistance to physical influences. Today, the SSD is being promoted as the main system drive because of its dramatic influence on the improved functionallity of both applications and operating system.
ContinueThe format defines the physical dimensions of the SSD disk. It is important to pay attention to avoid compatibility problems. Today we distinguish between the two main SSD formats:
Hard drive capacity defines the amount of free space available to you for the operating system, documents, programs, movies, and all the data you accumulate on your computer.
Capacity | What the Disk Can Handle |
from 120GB | operating system, basic set of programs |
from 240GB | operating system, a number of programs used, and a few games |
from 480GB | operating system, a large number of programs, and about 10 games |
from 960GB | operating system, almost all programs, lots of games and some videos and photos |
The interface in this context means how to connect the drive to a computer. Each interface has some features such as improved speed or power capabilities. Each interface has one or more specific connectors.
We use the internal interface to connect SSDs placed inside the computer
Port | Communication Interface | Maximum speed |
PCIe x4 | NVMe | 4000 MB/s |
U.2 | ||
M.2 (NVMe) | ||
M.2 (SATA) | AHCI (SATA III) | 600 MB/s |
mSATA | ||
SATA III |
The external interface is used to connect external drives as well. In these waters, the USB interface versions dominates the others. See the table below for the speeds of each interface.
USB Type | Speed |
USB 2.0 | 480 Mb/s |
USB 3.0 (3.1 Gen1) | 5 Gb/s |
USB 3.1 (3.1 Gen2) | 10 Gb/s |
The speed of reading for an SSD is the speed at which the device is able to access stored data. Writing speed is how fast the drive can receive data and save it.
SSD | MB/s (read/write) | IOPS (Read/Write) |
Lowest Class (AHCI) | 360/130 MB/s | 76,000/73,000 IOPS |
Middle Class (AHCI) | 540/520 MB/s | 97,000/88,000 IOPS |
Higher class (NVMe) | 2 000/800 MB/s | 170,000/135,000 IOPS |
Highest Class (NVMe) | 3 500/2 100 MB/s | IOPS 440,000/360,000 |
SSD (Solid State Drive) storage media are used as an alternative to hard drive media, especially in portable computers. They offer different ways to store data than conventional hard drives. Instead of read heads and rotating platters, SSDs use NAND flash memory. Like conventional hard drives, SSDs do not lose any data during power failure. There are also other types of solid state memory, eg. SDRAM and DRAM. However, they do not extend as far as those using flash memory.
The main advantages of SSD Drives are speed, power consumption and reliability. SSDs simply start functioning faster due to the absence of moving parts, have a higher reading speed than conventional hard drives and have an incredibly low latency (ie. seek time), which is 100 times faster. This accelerates operation - to boot the operating system and run different applications. Their power consumption and heat production is low, as they have no mechanical parts. This also relates to much higher reliability in operation. The mechanical parts in hard drives tend to wear out, and even risk destroying the drive with strong vibrations and temperatures. This does not apply to SSD Drives, meaning they are particularly suitable for portable computers. An almost insignificant disadvantage does exist as there is a limited number of write cycles for the existing types of SDDs, allowing operation over an average period of 51 years.
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