SSD Vs HDD
|
Attribute
|
SSD
|
HDD
|
|
Stands
for
|
Solid State Drive
|
Hard Disk Drive
|
|
Speed
|
SSD has lower latency, faster read/writes,
and supports more IOPs (input output operations per second) compared to HDD.
|
HDD has higher latency, longer read/write
times, and supports fewer IOPs (input output operations per second) compared
to SSD.
|
|
Heat,
Electricity, Noise
|
Since no such rotation is needed in solid
state drives, they use less power and do not generate heat or noise.
|
Hard disk drives use more electricity to
rotate the platters, generating heat and noise.
|
|
Defragmentation
|
SSD drive performance is not impacted by
fragmentation. So defragmentation is not necessary.
|
The performance of HDD drives worsens due
to fragmentation; therefore, they need to be periodically defragmented.
|
|
Components
|
SSD has no moving parts; it is essentially
a memory chip. It is interconnected, integrated circuits (ICs) with an
interface connector. There are three basic components - controller, cache and
capacitor.
|
HDD contains moving parts - a motor-driven
spindle that holds one or more flat circular disks (called platters) coated
with a thin layer of magnetic material. Read-and-write heads are positioned
on top of the disks; all this is encased in a metal case
|
|
Weight
|
SSD drives are lighter than HDD drives
because they do not have the rotating disks, spindle and motor.
|
HDDs are heavier than SSD drives.
|
|
Dealing
with vibration
|
SSD drives can withstand vibration up to
2000Hz, which is much more than HDD.
|
The moving parts of HDDs make them susceptible
to crashes and damage due to vibration.
|
|
Power Draw / Battery Life
|
Less power draw, averages 2 – 3 watts,
resulting in 30+ minute battery boost
|
More power draw, averages 6 – 7 watts and
therefore uses more battery
|
|
Cost
|
Expensive, roughly $0.10 per gigabyte
(based on buying a 1TB drive)
|
Only around $0.06 per gigabyte, very cheap
(buying a 4TB model)
|
|
Capacity
|
Typically not larger than 1TB for notebook
size drives; 1TB max for desktops
|
Typically around 500GB and 2TB maximum for
notebook size drives; 6TB max for desktops
|
|
Operating System Boot Time
|
Around 10-13 seconds average bootup time
|
Around 30-40 seconds average bootup time
|
|
Noise
|
There are no moving parts and as such no
sound
|
Audible clicks and spinning can be heard
|
|
Vibration
|
No vibration as there are no moving parts
|
The spinning of the platters can sometimes
result in vibration
|
|
Heat Produced
|
Lower power draw and no moving parts so
little heat is produced
|
HDD doesn’t produce much heat, but it will
have a measurable amount more heat than an SSD due to moving parts and higher
power draw
|
|
Failure Rate
|
Mean time between failure rate of 2.0
million hours
|
Mean time between failure rate of 1.5
million hours
|
|
File Copy / Write Speed
|
Generally above 200 MB/s and up to 550 MB/s
for cutting edge drives
|
The range can be anywhere from 50 – 120MB /
s
|
|
Encryption
|
Full Disk Encryption (FDE) Supported on
some models
|
Full Disk Encryption (FDE) Supported on
some models
|
|
File Opening Speed
|
Up to 30% faster than HDD
|
Slower than SSD
|
|
Magnetism Affected?
|
An SSD is safe from any effects of
magnetism
|
Magnets can erase data
|
