what is difference between sdd and hdd
Answers
Now it’s time to do some comparisons and determine which might be best for your individual needs - SSD or HDD? The best way to compare items is a table with a side by side comparison of items in which a green box indicates an advantage:
Attribute SSD (Solid State Drive) HDD (Hard Disk Drive)
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 $0.20 per gigabyte (based on buying a 1TB drive) Only around $0.03 per gigabyte, very cheap (buying a 4TB model)
Capacity Typically not larger than 1TB for notebook size drives; 4TB max for desktops Typically around 500GB and 2TB maximum for notebook size drives; 10TB 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
If we tally up the checkmarks, the SSD gets 9 and HDD gets 3. Does that mean the that an SSD is three times better than an HDD? Not at all. As we mentioned earlier, it all depends on individual needs. The comparison here is just to lay out the pros and cons for both options. To aid you even more, here are some rules to follow when you decide which drive is best for you:
An HDD might be the right choice if:
You need lots of storage capacity, up to 10TB
Don’t want to spend much money
Don’t care too much about how fast a computer boots up or opens programs - then get a hard drive (HDD).
An SSD might be the right choice if:
You are willing to pay for faster performance
Don’t mind limited storage capacity or can work around that (though consumer SSD now go up to 4TB and enterprise run as high as 60TB)
HDDs are still the popular choice for the majority of average consumers, usually choosing the HDD as the storage option in their new computer simply due to the much cheaper cost. However, more and more consumers desire top computing performance and are opting for an SSD inside their new setup or as an upgrade to their current one. As such, SSDs are well on their way to becoming the mainstream, standard storage mechanism, especially for laptops given the advantages they present for a mobile device (they are currently the default storage device in the Ultrabook category). That said, there will always be a market for both HDDs and SSDs. The advent of mSATA SSD devices and hybrid drives that include both SSD and HDD features is another option for consumers seeking a bit of the best of both worlds, but that’s a topic for another day!