When it comes to PC or Laptop buying we look into different criteria like hardware, software, price etc. Especially our main focus will be on best hardware configuration at an affordable price. So we decided to publish a series of articles to guide you in PC or Notebook purchase. In PC or Notebook purchase storage (SSD or HDD) is one of the important criteria because everything is digitized these days. So people love to store lot of data on their PC or Notebook’s disk space. Basically there are two types data storage devices available for PCs or Laptops. They are SSD (Solid State Drive or Solid State Disk) and HDD (Hard Disk Drive). In this post we will explain these two storage devices in terms of how they function, performance, storage availability and price.
What is an SSD (Solid State Drive)?
Solid State Drive shortly called as SSD is a data storage device which can be used to store and retrieve the digital data using NAND based flash memory technology. A NAND memory is a non-volatile memory which means even though you turn off the disk the data won’t get deleted. Earlier data used be stored on moving magnetic devices with read write pointers on it. But an SSD doesn’t contain any movable parts in it thus you won’t hear any noise from it. Since it has no movable parts it won’t generate heat. Earlier data read and write was done in sequential manner but an SSD can fetch data from any location of flash memory thus very low read latency. Due to their simple circuit design they are small in size. Average read write speed of an SSD is 600MB/s which means better performance.
What is an HDD (Hard Disk Drive)?
Hard Disk Drive short for HDD is a data storage device which uses rapidly rotating disks called platters with magnetic read write head to store or retrieve data. From past half century HDD is leading in the PC market with more sales though SSD sales increasing year by year. Since it has movable disks power consumption is high in HDD. Because of movable parts you will hear noise from HDD and also it produces heat. That’s why especially in Notebooks they apply cooling paste. The read latency is high because it has to fetch sequentially from individual blocks. HDD is bigger in size compared to SSD because of it’s platters. The performance of HDD depends on the speed of rotating disks. Typical HDD drive spin at 5400 RPM (Revolutions per minute), some high end drive spin at 7200 RPM. Server based disks can spin up to 15400 RPM. The higher the RPM higher the performance of an HDD. Average read write speed of an HDD is 140MB/s.
SSD vs HDD
|Attribute||SSD (Solid State Drive)||HDD (Hard Disk Drive)|
|Technology||NAND Flash Memory||Rotating Disks with Magnetic Head|
|Size||Small||Big compared to SSD|
|Boot Time||Average boot time 20 Seconds||Average boot time 40 Seconds|
|Read Write Speed||Average Read Write Speed 600MB/s||Average Read Write Speed 120MB/s|
|Noise & Vibration||No moving parts hence no noise and vibration||Because of moving disks there is noise and vibration in HDD|
|Heat||Little heat because no moving parts in SSD||Moving disks produce heat in HDD|
|Failure Rate||SSD won't fail mechanically because it has no moving part. They fail on power outages||Average failure rate of HDD is 6 years (max 9-11 years)|
|Power Consumption||2 - 3 watts||6 - 7 watts|
|Cost||$0.60 per GB||$0.05 per GB|
|Capacity||Mostly 512 GB but available up to 2 TB||Up to 6 TB|
|Performance||Performance is high due to it's NAND flash memory.||Performance depends on disk RPM but low compared to SSD.|
If you want more storage at low price and don’t bother about performance then go for an hard drive (HDD). If performance is highest priority and can adjust with moderate storage then go for solid state drive (SSD). As technology evolves old hardware fades in time. Similarly SSDs will replace HDDs in the coming years.
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