The difference between Hard Disk HDD Drive and SSD

Hard Disk Drive (HDD)

Hard Disk Drives (HDD) have been around for decades and are the traditional storage medium that most computers are still using. An HDD consists of spinning disks (called platters) that store your data, with read/write head on an arm that accesses the data while the disks are spinning. A single platter can hold about 1TB of data.


Hard disk drives (HDD) or hard disk (also known as fixed disk) is an electromechanical storage device for data that utilizes magnetic storage to save and retrieve digital data by using one or more quickly turning disks (platters) covered with magnetic substance.

They are coupled with magnetic heads that are usually mounted on a moving arm, that reads and write data onto the platter’s surface.Data is accessed via random access this means that the individual blocks of data may be stored or read from in any order and not necessarily sequentially.

HDDs are a kind of non-volatile storage device, which can store information even after powering off. An HDD consists of a spinning disk with read/write head on an arm, powered by a spindle motor assembly. The head floats on an air cushion as the disk rotates underneath. The head is driven by voice coil actuator mechanisms or land elements to access different parts of the disk quickly.

Disk platters are made from materials like aluminum alloy, glass, ceramic and synthetic ceramic composites like carbon fiber-reinforced polymer.[3][4] They are coated with PMMA or other corrosion resistant materials and lubricated with lubricant layers containing graphite or fluorocarbon.[5]


  • HDDs are less expensive than SSDs.
  • They tend to be more reliable due to their simple construction when compared to SSDs.
  • They are not as sensitive to shock and vibration, making them ideal for use in laptops.
  • Can be used in any device that requires storage, including PCs, laptops, gaming consoles, and more.


Price:The initial price for SSDs is higher than for HDDs in terms of cost per gigabyte (GB). HDD capacities are generally measured in terabytes (TB), while SSDs are measured in GB. Therefore, it can appear that SSDs are much more expensive than HDDs.

Reliability/Build Quality: Since SSDs have no moving internals, they are more likely to withstand accidental drops and other types of physical trauma. However, they are still susceptible to data corruption if exposed to extreme heat or powerful magnets

Solid State Drive (SSD)

A SSD is a type of data storage device that makes use of integrated circuit assemblies to keep data indefinitely. SSD technology primarily uses two types of flash memory: NOR and NAND. A big advantage of SSDs over HDDs is that SSDs don’t have any moving internals and thus are less susceptible to physical shock and vibration


An SSD is a data storage device that reads and writes data on a solid-state flash memory chip. An SSD forms part of the storage subsystem in a computer, server, or other computing system. HDD is a spinning disk-based data storage device.

An HDD forms part of the storage subsystem in a computer, server, or other computing system. The first HDDs were invented in the 1950s and commercialized in the 1960s. SSDs are about 100 times faster than HDDs for read/write operations.


There are several advantages of SSDs over HDDs:

  • SSDs are faster. They can boot up your computer in a few seconds and load apps almost instantaneously. This is because they have no moving parts, so they can access data much faster than HDDs.
  • SSDs are more durable and reliable. They can withstand drops and other physical shocks better than HDDs because they have no moving parts.
  • SSDs use less power, which means they can extend the battery life of your laptop.
  • SSDs are quieter because they have no moving parts.
  • SSDs are available in a variety of form factors, including 2.5-inch drives that fit in most laptops and 3.5-inch drives that fit in most desktop computers.


SSDs are more expensive than hard drives in terms of price per gigabyte. The jury is still out on the reliability of SSDs. Hard drives have been around for many years, and their reliability has been well-established. SSDs are a relatively new technology, and their long-term reliability is not yet known. SSDs can be more sensitive to physical shock than hard drives. If you drop your laptop, there is a greater chance that the SSD will be damaged and your data lost.


HDD is the traditional storage drive which uses spinning disks to store data, while SSD storage doesn’t have any moving internals and instead relies on microchips. The big difference between the two is in the speed at which they operate.


One of the most noticeable performance differences between hard drives and solid state drives is startup time. A PC or laptop with an SSD generally starts up in 10 seconds or less. That’s because traditional hard drives need time tospin up to their operating specs, which can take around 30 seconds depending on the model. With no moving parts, SSDs can start up almost instantaneously.

When it comes to moving files around, copying and pasting data, and general tasks within the operating system, SSDs are also significantly faster than HDDs. That’s largely because hard drives need time to locate and move the read-write head to different tracks on the disk platter when requested data is not on the same track as where the read-write head is currently positioned.

An SSD performs these actions much more quickly since it has immediate access to any location on the storage chip since there are no tracks or a read-write head to physically move around.


HDD: Hard disk drives have been around for a long time and are the most common type of storage found in laptops, desktops, and servers. They are also used in some smaller devices like external hard drives and memory cards. With an HDD, data is stored on spinning disks called platters. The platters are read by a needle-like arm called an actuator that moves back-and-forth across the disks as they spin.

SSD: Solid state drives are a newer type of storage that is becoming more popular due to their many advantages over HDDs. SSDs also use Flash memory to store data, but there are no moving parts involved. This makes SSDs much faster than HDDs, as well as more durable and more energy-efficient.

Power Consumption

HDD typically uses 0.15 Watts/GB, while SSD typically uses 0.03 Watts/GB (power consumption may vary depending on the model and manufacturer). Thus, an SSD can save you up to 0.12 Watts/GB, or 80% of the power that an HDD uses. In other words, if you have a 500 GB HDD, it will use about 75 Watts, whereas a 500 GB SSD will only use about 6 Watts.


HDDs are generally more reliable than SSDs. This is because SSDs are more susceptible to physical damage and data corruption. HDDs are also better at handling sudden power outages and power surges.

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