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Archive for January, 2011

Highest Net Index within the Saarc Region (Maldives Ranked No.1)

January 27th, 2011 No comments

Maldives

Highest Net Index within the region so I give #1 within Saarc Region

Pakistan

2nd Highest Net Index within the Saarc region.

India

3rd Highest Net Index within the Saarc region.

Sri Lanka

4th Highest Net Index within the Saarc region.

Bangladesh

5th Highest Net Index within the Saarc region.

Nepal

6th Highest Net Index within the Saarc region.

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Canon 7D with Lens Mount Hot Rod

January 18th, 2011 No comments
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ASUS Ee Pad Slider

January 16th, 2011 No comments
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How does RAID 5 work ? what is it ?

January 14th, 2011 No comments

We all have limited time to study long and complicated information about RAID theories, but you may be interested as to how RAID 5 works.

First we need to remind you XOR definition:

XOR function result is equal 1 if both arguments are different.

XOR (0, 1) = 1
XOR (1, 0) = 1

XOR function output is equal 0 if both arguments are same.

XOR (0, 0) = 0
XOR (1, 1) = 0

Now let us assume we have 3 drives with the following bits:

| 101 | 010 | 011 |

And we calculate XOR of those data and place it on 4th drive

XOR (101, 010, 011) = 100     (XOR (101,010) = 111 and then XOR (111, 011) = 100

So the data on the four drives looks like this below:

| 101 | 010 | 011 | 100 |

Now let’s see how the XOR MAGIC works. Let’s assume the second drive has failed. When we calculate XOR all the remaining data will be present from the missing drive.

| 101 | 010 | 011 | 100 |

XOR (101, 011, 100) = 010

You can check the missing other drives and XOR of the remaining data will always give you exactly the data of your missing drive.

| 101 | 010 | 011 | 100 |

XOR (101, 010, 100) = 011

What works for 3 bits and 4 drives only, works for any number of bits and any number of drives. Real RAID 5 has the most common stripe size of 64k (65536 * 8 = 524288 bits )

So the real XOR engine only needs to deal with 524288 bits and not 3 bits as in our exercise. This is why the RAID 5 needs a very efficient XOR engine in order to calculate it fast.

So when adding one drive for parity you will be able to rebuild the missing data in case of any drive failure.

In our example we have explained RAID 4 where parity is on a dedicated drive. RAID 5 will distribute parities evenly between all drives. Distributed parity provides a slight increase in performance but the XOR magic is the same.

To learn more about RAID 5 please go to Wikipedia article:

http://en.wikipedia.org/wiki/RAID_5#RAID_5

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DNS Trouble

January 14th, 2011 No comments

DNS Trouble offers DNS tools, MX Checkers and resources needed everyday by thousands of IT Consultants and Administrators World Wide. These tools vary in depth and all serve the purpose diagnosing and testing DNS and EMail related issues. The great thing about DNS Trouble is that the tools are FREE to use.

Check it out

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Forgot Mac Password? How to Reset Your Mac Password (with or without CD)

January 13th, 2011 No comments

So you forgot your Mac password… uh oh. Don’t worry, it happens and you aren’t out of luck. You’ll need to reset the forgotten password and there’s several ways to do this, we’ll focus on the two best methods; one does not require a Mac OS X installer CD and is a great hack, and the other is much more simple if you happen to have a Mac OS X DVD laying around.

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Is Apple Killing Off The iPhone And iPad ‘Home’ Button?

January 13th, 2011 No comments

Well this ought to be interesting. Apple has made the pre-release code for the next version of its iOS software available for developers to tinker around with. This is the underlying software that will eventually end up on iPhones, iPads and iPod Touches—called iOS 4.3.

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Fujitsu Shows Windows 7-based Tablet

January 12th, 2011 No comments

Fujitsu demoed its next-generation tablet at the Consumer Electronics Show. It came as no surprise, as the company has long been a player in highly mobile and slate-style products–especially ones aimed at corporate and vertical markets in previous pushes towards a tablet PC.

“There will be a lot of entries, and they’ll either fly or die,” Fujitsu’s product manager Paul Moore astutely notes.

For Fujitsu’s first tablet, due in the United States in the first half of 2011, the company is showing a 10-inch Windows slate design. The slate is running a 1280 by 800 resolution, 400 nit screen that uses N-trig’s multi-touch screen technology for doing finger and pen navigation on the same screen. (HP’s Slate, announced late fall 2010, already uses this technology, and N-trig has announced support for Android devices as well.) This technology alone makes the unnamed Fujitsu slate a good fit for the company’s target vertical markets, which include finance and healthcare.

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5 Reasons to Wait for iPad 2.0

January 10th, 2011 No comments

1. Wait for the Camera – It’s Coming
2. Voice Calls to Come Later
3. Annotations for iBooks
4. Hold out for Verizon
5. Wait for Multitasking via OS 4.0
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