HDD vs. SSD

Comparison chart

HDD versus SSD comparison chart

	HDD	SSD
	current rating is 3.51/5 1 2 3 4 5 (316 ratings)	current rating is 4.21/5 1 2 3 4 5 (407 ratings)
Stands for	Hard Disk Drive	Solid State Drive
Speed	HDD has higher latency, longer read/write times, and supports fewer IOPs (input output operations per second) compared to SSD.	SSD has lower latency, faster read/writes, and supports more IOPs (input output operations per second) compared to HDD.
Heat, Electricity, Noise	Hard disk drives use more electricity to rotate the platters, generating heat and noise.	Since no such rotation is needed in solid state drives, they use less power and do not generate heat or noise.
Defragmentation	The performance of HDD drives worsens due to fragmentation; therefore, they need to be periodically defragmented.	SSD drive performance is not impacted by fragmentation. So defragmentation is not necessary.
Components	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 cas	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.
Weight	HDDs are heavier than SSD drives.	SSD drives are lighter than HDD drives because they do not have the rotating disks, spindle and motor.
Dealing with vibration	The moving parts of HDDs make them susceptible to crashes and damage due to vibration.	SSD drives can withstand vibration up to 2000Hz, which is much more than HDD.

Components and Operation

A typical HDD consists of a spindle that holds one or more flat circular disks (called platters) onto which the data is recorded. The platters are made from a non-magnetic material and are coated with a thin layer of magnetic material. Read-and-write heads are positioned on top of the disks. The platters are spun at very high speeds with a motor. A typical hard drive has two electric motors, one to spin the disks and one to position the read/write head assembly. Data is written to a platter as it rotates past the read/write heads. The read-and-write head can detect and modify the magnetization of the material immediately under it.

In contrast, SSDs use microchips, and contain no moving parts. SSD components include a controller, which is an embedded processor that executes firmware-level software and is one of the most important factors of SSD performance; cache, where a directory of block placement and wear leveling data are also kept; and energy storage - a capacitor or batteries - so that data in the cache can be flushed to the drive when power is dropped. The primary storage component in an SSD has been DRAM volatile memory since they were first developed, but since 2009 it is more commonly NAND flash memory. The performance of the SSD can scale with the number of parallel NAND flash chips used in the device. A single NAND chip is relatively slow. When multiple NAND devices operate in parallel inside an SSD, the bandwidth scales, and the high latencies can be hidden, as long as enough outstanding operations are pending and the load is evenly distributed between devices.

Top 3 Construction Apps for 2018

1. JobFLEX

Best for Estimates and Bids

JobFLEX is an estimating and bid management app that delivers estimates on the spot, with or without a cellular connection. Create customizable forms to preview, email, and print.

Being able to quickly and easily create estimates for customers is critical. The difference between gaining a new client and losing a potential job often hinges on how quickly and professionally you can turn an estimate around. With JobFLEX, there's no tech savvy needed. Deliver estimates on the spot, with or without a cellular connection. Create and edit customizable forms, then just drag and drop line item costs, materials, and photos. When you're finished, preview, email, or print estimates with just one tap. According to recent research by Software Advice, this could help you get your bids in 20 percent faster and with four times the accuracy.

  

2. Red Cross First Aid

Best for Safety

Red Cross First Aid puts essential first-responder skills at your fingertips. Get videos and step-by-step instructions on how to care for broken bones, strains, sprains, and more.

There's nothing more important than safety on the job site. Unfortunately, that's because it's one of the most dangerous industries to work in. The "fatal four" - the four leading causes of fatalities in the construction industry - are responsible for more than 500 construction worker deaths each year.Knowing how to handle those injuries quickly and correctly on the job site could be the difference between life and death. That's where the Red Cross First Aid app comes in. With videos, quizzes, and step-by-step instructions, the app is intended to help anyone handle unexpected emergencies with confidence.

3. DroneDeploy

Best for Mapping

Drone Deploy can help you survey your site with the help of 3-D models. Get measurements for things like distance, area, and volume.

The faster you and your crew complete new jobs, the faster everyone gets paid - and the more jobs you can take on! Things like surveying and mapping the job site are unavoidable and time-intensive tasks. With DroneDeploy, you can survey your site accurately in a fraction of the time, with drone maps and 3D models. Quickly and easily collect aerial data to improve and streamline your site planning. Get instant measurements for things like distance, area, and volume. And see a bird's eye view of your project as it progresses over time. Then effortlessly share your progress with your team members to keep your project on task.

Cover Book For Computer Science

UHANS i8

UHANS i8 Face Recognition 5.7-inches 18:9 Full Screen Smartphone 4GB RAM 64GB ROM

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Price:                    

RM

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Dispatch                  :      Usually will be shipped in 72 hours
Dual Rear Camera     :      8MP selfie shooter (Bokeh effect)
Display                    :      5.7-inch HD+
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Performance            :       runs smooth and stable on Android 7.0                              
                              :       can do whatever you want without any lag

Baterry                   :       big enough to get you through all day                             
                              :       a non-removable 3500Mah battery