Group 1 - Computer Hard Drive - 1 - Revision history

UB08G01: /* References */

2008-12-05T06:55:46Z

References

UB08G01: /* Improvements at component level: */

2008-12-04T22:29:53Z

Improvements at component level:

UB08G01: /* Additional Part Information: */

2008-12-04T22:29:16Z

Additional Part Information:

UB08G01: /* After Disassembly */

2008-12-04T22:28:26Z

After Disassembly

Show changes

UB08G01: /* Introduction */

2008-12-04T19:15:38Z

Introduction

UB08G01 at 03:32, 4 December 2008

2008-12-04T03:32:35Z

UB08G01: /* Before Disassembly Section */

2008-12-02T23:50:16Z

Before Disassembly Section

UB08G01: /* Introduction */

2008-12-02T23:48:19Z

Introduction

UB08G01: /* Introduction */

2008-12-02T23:27:22Z

Introduction

UB08G01: /* Introduction */

2008-12-02T22:47:44Z

Introduction

← Older revision		Revision as of 06:55, 5 December 2008
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	==References==		==References==
	[http://www.apastyle.org/ APA Style]		[http://www.apastyle.org/ APA Style]
		+
		+	Executive Summary and Introduction References:
		+
		+	1. Byard, F., Larry. A Brief History of the Hard Disk Drive. Retrieved on October 17, 2007
		+	<http://www.duxcw.com/digest/guides/hd/hd2.htm...>
		+	2. Story from BBC NEWS. Factfile: Hard disk drive. Retrieved on October 18, 2007
		+	<http://news.bbc.co.uk/2/hi/technology/6677545.stm
		+	3. Brain, Marshall. How hard disks work. Retrieved on November 14, 2007
		+	<http://www.howstuffworks.com/hard-disk.htm>
		+	4. IDE/ATA Configuration and Cabling
		+	http://www.storagereview.com/guide2000/ref/hdd/if/ide/conf.html
		+	5. IDE/ATA and SCSI Comparisons
		+	http://www.storagereview.com/guide2000/ref/hdd/if/compSummary.html
		+	6. How hard drive works
		+	http://www.duxcw.com/digest/guides/hd/hd4.htm
		+	7. Schroeder, B. and Gibson, G. A. 2007. Disk failures in the real world

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 *Create a mechanism to manually unlock the actuator in case the actuator lock becomes stuck or there is not sufficient air pressure to release it.
 *Replace motor lead pins with more durable and easier to assemble plug and socket (see #4 on re-assembly).
 ===CAD model:===

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 **Reason for its appearance:  Must be thin enough to flex under the force of the air pressure from the spinning platters.
 **Function:  To read and write data to and from the platters.
 ===Improvements at component level:===

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 ==Introduction==
-The hard disk drive, more commonly referred to as a hard drive is the part of a computer where all the information is stored. As a cliché the hard drive can be labeled as the brain of the computer, a place where each and every bit of information lies [2]. Having come into existence around half a century ago, the hard drive has become an integral part of the computer industry. The progress made in the field of hard drives in such a short period of time is really remarkable. The changes in the size of the hard drive serve as a good example to this as the first hard drive ever made was 24 inches long and was capable of storing only 5 megabytes of data at a cost of over $100 per megabyte.
+The hard disk drive, more commonly referred to as a hard drive is the part of a computer where all the information is stored. As a cliché the hard drive can be labeled as the brain of the computer, a place where each and every bit of information lies. Having come into existence around half a century ago, the hard drive has become an integral part of the computer industry. The progress made in the field of hard drives in such a short period of time is really remarkable. The changes in the size of the hard drive serve as a good example to this as the first hard drive ever made was 24 inches long and was capable of storing only 5 megabytes of data at a cost of over $100 per megabyte.
 The technology used in hard drives has been setting new standards periodically. Earlier, hard drives used electromagnets based on the principle of electro-magnetic induction to read the data. Later, drives began using MIG heads and thin film heads.  Today, drives have the read and write elements close to each other but at the same time kept separate.

← Older revision		Revision as of 03:32, 4 December 2008
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	==References==		==References==
	[http://www.apastyle.org/ APA Style]		[http://www.apastyle.org/ APA Style]
−	~~You must use this format (It's easier than MLA, so don't worry).~~

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 *<b>Tarandeep Sodhi:</b> "Executive summary" and "Introduction" sections of wiki report.
-==Before Disassembly Section==
+==Before Disassembly==
 ===Purpose of product / How it works:===

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 IDE drives were the first ones to popularize integrating the logic controller onto the hard disks. This helped in solving many issues that were related to the hard disk for example: poor signal integrity, and the capability of allowing any controller to work with any hard disk.
-||Member's and Contributions||
+===Member's and Contributions===
-*<b>Douglas Keddie:</b> Handled "before disassembly" and "after assembly" section of wiki report.
+The majority of the project was completed during meetings of the entire group with all members contributing.  This includes product disassembly, assembly and all stages of the "after you assemble the product" section of the assignment.  The section entitled "after you disassemble the product" was also completed as a group but with Taran absent due to illness.  The wiki report and oral presentation were split up.  Each member's individual responsibilities were as listed below.
 ==Before Disassembly Section==

← Older revision		Revision as of 23:27, 2 December 2008
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	IDE drives were the first ones to popularize integrating the logic controller onto the hard disks. This helped in solving many issues that were related to the hard disk for example: poor signal integrity, and the capability of allowing any controller to work with any hard disk.		IDE drives were the first ones to popularize integrating the logic controller onto the hard disks. This helped in solving many issues that were related to the hard disk for example: poor signal integrity, and the capability of allowing any controller to work with any hard disk.
		+
		+	\|\|Member's and Contributions\|\|
		+
		+	*<b>Douglas Keddie:</b> Handled "before disassembly" and "after assembly" section of wiki report.

	==Before Disassembly Section==		==Before Disassembly Section==

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 Today there are many types of hard drives present which function across different types of interfaces such as ATA, SATA, PATA, SCSI, SSD, IDE each one benefiting some area of the computing industry. These hard drives share more or less the same physical properties. The only difference between them is the interface across which they work. All the interfaces aim at providing higher random access speeds, longer MTBF (mean time between failures), higher read and write speeds, raw bandwidth and faster transfer speeds. The interface we are dealing with here is known as IDE - Integrated Drive Electronics.
-IDE (Integrated Drive Electronics) were first introduced in the mid 1980’s.  IDE later renamed to ATA, and then later to PATA          ( Parallel ATA). IDE hard disk drives consist of a motor, spindle, platters, read/write heads, actuator, as well as many other components. IDE hard drives have been widely adopted as they proved to be easier to use and performed better than previous hard disks know as “hard cards”. Hard cards/hard disks were interfaced to a PC motherboard via an expansion board known as a hard disk controller. The use of IDE drives in servers and networks has given it a lot of impetus to create next generation transfer speeds. The main advantage of IDE drives is the speed which can be offered at a very low cost.
+IDE (Integrated Drive Electronics) were first introduced in the mid 1980’s.  IDE was renamed to ATA, and then later to PATA          ( Parallel ATA). IDE hard disk drives consist of a motor, spindle, platters, read/write heads, actuator, as well as many other components. IDE hard drives have been widely adopted as they proved to be easier to use and performed better than previous hard disks know as “hard cards”. Hard cards/hard disks were interfaced to a PC motherboard via an expansion board known as a hard disk controller. The use of IDE drives in servers and networks has given it a lot of impetus to create next generation transfer speeds. The main advantage of IDE drives is the speed which can be offered at a very low cost.
 Data in an IDE hard disk is stored magnetically in a spiral pattern on a series of platters.  The data is retrieved/stored by the read/write heads which are controlled by the actuator arm which in turn is controlled by the electrical impulse received from the logic board. The platters are mounted on the spindle which is turned by the drive motor. Most current IDE hard disk drives spin at 5,400, 7,200, or 10,000 RPM some at up to 15,000 RPM.