Difference Between SSD and HDD and NVMe

What is SSD?

Solid-state drives are a newer generation of storage devices used in computers. SSDs store data using flash-based memory, which is much faster than the traditional hard disks they’ve replaced.

SSD technology primarily uses two types of flash memory: NAND-based flash and NOR-based flash.

NAND-based flash memory is less expensive and is therefore more commonly used in SSDs. SLC-based flash memory offers faster write speeds and is more durable than NAND-based flash, but it is more expensive.

The benefits include faster boot times, faster data access, and lower power consumption. However, SSDs are more expensive than hard drives. SSDs have no moving parts and are much faster at retrieving and writing data.

It is usually much faster than the traditional hard drive and is more resistant to physical shock. SSDs are becoming increasingly popular, especially in laptops and other portable devices.

What is HDD?

A hard disk drive (HDD) is an electro-mechanical data storage device that uses magnetic storage to store data.

They recover the digital information. They use one or more rigid, rapidly rotating disks coated with magnetic material.

The data is read from and written to the disk by an arm with a read/write head that moves across the disk surface.

It consists of more spinning disks, or platters, with magnetic data storage media.  The platters are paired with magnetic heads, usually arranged on a moving actuator arm. They also read and write data on the platter surfaces.

HDDs are found in desktop and laptop computers as well as servers. They are used for storing operating system files, application programs, and user data.

What is NVMe?

NVMe is specific to accessing solid-state drives (SSDs) attached through the PCI Express bus. NVMe stands for Non-Volatile Memory Express.

NVMe was designed from the ground up to take advantage of the low latency and parallelism of SSDs.

They designed NVMe for spinning disks, NVMe reduces latency, increases IOPS and throughput, and enables more cost-effective SSDs.

The newest and fastest type of SSD on the market is the NVMe drive. These drives are designed for speed, with the ability to read and write data much faster than traditional SSDs.

If you’re looking for the fastest possible performance from your SSD, then an NVMe drive is the way to go.

Difference Between SSD and HDD and NVMe

The main difference between SSDs, HDDs, and NVMe is their storage capacities and speeds.

SSDs can store up to 4 TB of data and have a speed of up to 550 MB/s.

HDDs can only store up to 2 TB of data and have a speed of up to 150 MB/s.

NVMe is a newer technology that is not compatible with all computers. NVMe can store up to 8 TB of data and has a speed of up to 3500 MB/s.

Comparison Between SSD and HDD and NVMe

Parameters of ComparisonSSDHDDNVMe
DefinitionAn SSD is a type of computer data storage that uses solid-state flash memory to store information.A hard disk drive (HDD) is a data storage device that uses spinning disks to store data.NVMe is a solid-state drive (SSD) attached through the PCI Express (PCIe) bus.
Read/write speedSSDs are faster than HDDs, but they’re also more expensive.speed of an HDD depends on the rotational speed of the disk.NVMe is the newest type of storage device, and it’s even faster than SSDs, but it’s also more expensive.
Cost per GBSSDs is the most expensive but also the fastest.HDDs are cheaper but slower.NVMe drives are somewhere in between.
Maximum capacitySSDs have the fastest data access speed and largest capacity.HDDs have the slowest data access speed but can store more data.NVMe is a newer type of storage that is faster than SSDs but has a smaller capacity.
SATA controller (Serial Advanced Technology Attachment)SATA controllers have a maximum theoretical speed of 600 MB/s. The fastest SSDs can reach speeds of 4500 MB/s.The SATA controller is backward compatible with SATA 1.5 Gb/s and 3 Gb/s devices.It’s much faster than the old SATA standard, with speeds of up to 2000 MB/s.


  1. https://www.usenix.org/event/usenix08/tech/full_papers/agrawal/agrawal_html/
  2. https://ieeexplore.ieee.org/abstract/document/5257351/