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1) Chapter 2: Online Backups

Online backups are way different from online syncing such as cloud Box. That's because online-backup services continually save a copy of every personal file on your computer to a safe offsite data center; syncing services copy only items in designated folders with the aim of distributing clones of those items to your other computers and mobile devices. I personally use drop box to unload back up files for my use of my homework or old photos. One thing that I have noticed is the the data-traffic flow is different as well. A syncing service like Dropbox uploads file changes from your computer to its servers, then broadcasts the files. https://www.tomsguide.com/us/best-cloud-backup,rev...


2) Chapter 2: Computers are toxic


The central processing unit in a computer contains toxic substances, and lead is found in circuit boards. Metal plates and housings may contain chromium, which is used to harden and protect metal plates from corrosion. Motherboards and connectors often contain beryllium. Cadmium is commonly found in chip resistors, semi-conductors, infrared detectors, stabilizers, cables and wires. Circuit boards, switches and relays contain mercury as well chromium. Brominated flame retardants are used in many components, including circuit boards and plastic casings.

http://smallbusiness.chron.com/toxic-components-computers-monitors-69693.html

Safety and recycling are two very important things when working on or disposing a computer. The article says that most manufacturers offer businesses some form of recycling service. They can offer trade-in discounts or even cash for old equipment. The manufacturer saves money by recovering working parts rather than making new.


3) Some Dos and Donts when Working Inside a Computer Case

Take notes to keep track of what you have removed, attached, set aside etc. That way when it's time to retrace your steps or put things back you won't have such a hard time remembering what's what and where's where. Don't touch a microchip with a magnetized screwdriver. When handling motherboards, cards and drives, don't touch the chips on the device but rather hold expansion cards by the edges. The only exception to touching the inside of a computer that is on is when you're using a using a multimeter to measure voltage output.


4) Appendix A Volt Vs Watt

Before working with any electrical component including a computer, it is necessary to understand the difference between Watt and Volt, which are both units of electrical measurement.

Volt: Uses the symbol V. It is the measure of electrical force measured in volts, electric potential difference (voltage). Voltage is what makes the electric charges move. It is the force, the push that causes charges to move in a wire or other electrical conductor. Energy can cause the charges to move, and since moving charges is current, the voltage can cause a current.

Watt: Uses the symbol W. It is the standard unit of power in the International System of Units (SI), equivalent to one joule per second and equal to the energy in a circuit in which a current of one ampere flows across a potential difference of one volt. A one-watt light bulb will change one joule of electrical energy into light energy very second. It is a measure of an appliance's power.

Example: The United States standard electric voltage is 110v. Therefore when using a 40watts bulb, the bulb uses 40w per second to light and the amount of current supplied to light the bulb is 110 volt.


5) Appendix A: Safety First

It is always of the utmost importance to maintain safety in anything that you may be doing. Along with that many people tend to ignore the safety risks that are associated with working within a computer. There are some safety concerns not only for the individual that is working withing the computer system but there is also a large risk to the hardware within the system itself. If you are not properly grounded you could risk being shocked or even risk shocking other hardware and in turn rendering it useless and in need of replacement. I am glad that this is a topic that we are going over within this course.


6) Chapter 6: Hard drive Technologies


ard drives are the key components in the computer. We may need to purchase a hard drive to replace the old drive or to have additional hard drive. These days we have a choice of Hard Disk Drive (HDD), Solid State Drive (SSD) and Hybrid Hard Drives. It is necessary to know and understand the options available to purchase the right kind of hard drive suitable for our use.

Hard Disk Drive (HDD):

The hard disk drive is a data storage device that uses magnetic storage to store and retrieve digital information. It has one, two, or more platters, or disks, that stack together and spins in unison inside a sealed metal housing that contains firmware to control reading and writing data to the drive and to communicate with the motherboard. The disk surfaces are covered with a magnetic medium that can hold data as magnetized spots. It is a traditional method of the hard drive and comparatively less priced than the newer types of hard drives.

Solid State Drive (SSD):

The solid-state drives are also storage devices, and it fulfills the same function as a traditional hard disk drive (HDD). The drive is built using nonvolatile flash memory instead of the spinning metal disks found in conventional HDD. SSD is similar to the USB flash drives, but it is a massive USB flash drive. The SSD uses no moving parts, and so it has a longer lifespan, it consumes less power to operate and does not lose data even after power is turned off. The SSD uses the EEPROM (Electronically Erasable Programmable Read-Only Memory) chips inside the drive housing to store data, and so it can read and write data faster. Comparatively expensive and the price increases per gigabyte.

Hybrid Hard Drives:

The hybrid hard drive (H-HDD), sometimes called a solid-state hybrid drive (SSHD). This hard drive combines the technological advantages of both the HDD and the SSD. The flash component serves as a buffer to improve drive performance. Hybrid drives are as efficient as the HDD and SSD, and the operating system must support this technology to use it.

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