I will recommend you to do this:
1. Open Registry Editor by typing regedit in Run dialog.
2. Navigate to the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\
3. Find a sub key inside it named “StorageDevicePolicies”.
4. Now find a Dword key named "Writeprotect"
5. Modify this key 1 to 0.
6. Click OK, and remember to restart the PC
Monday, October 5, 2009
Sunday, October 4, 2009
Difference between Bluetooth and Infrared technology
Infrared technology is what most TV remotes use. The distance an infrared signal can travel varies based on the strength of the remote, but is usually less than 50 feet for household electronics. In order for an infrared signal to be detected, there must be a direct line of sight between the transmitter (remote) and the receiver (TV). If there is a wall or large object between them, the signal will not pass through it.
Bluetooth, on the other hand, uses a radio frequency, which allows transmission through walls and other objects. The standard range of a Class 3 Bluetooth device is about 30 ft., which makes it ideal for syncing PDAs with computers, using wireless cell phone headsets, and enabling handsfree cell phone use inside Bluetooth-enabled automobiles. Because Bluetooth technology is based on a standard 2.4 GHz frequency, different Bluetooth devices can typically communicate with each other, regardless of the manufacturer. Most infrared devices only work with proprietary equipment.
While Bluetooth is well on its way to replacing infrared in many different areas, the technology is not meant to be used for wireless networking. Instead, Wi-Fi technology, which has a larger range and higher bandwidth than Bluetooth, is the standard that most wireless networking equipment uses.
Bluetooth, on the other hand, uses a radio frequency, which allows transmission through walls and other objects. The standard range of a Class 3 Bluetooth device is about 30 ft., which makes it ideal for syncing PDAs with computers, using wireless cell phone headsets, and enabling handsfree cell phone use inside Bluetooth-enabled automobiles. Because Bluetooth technology is based on a standard 2.4 GHz frequency, different Bluetooth devices can typically communicate with each other, regardless of the manufacturer. Most infrared devices only work with proprietary equipment.
While Bluetooth is well on its way to replacing infrared in many different areas, the technology is not meant to be used for wireless networking. Instead, Wi-Fi technology, which has a larger range and higher bandwidth than Bluetooth, is the standard that most wireless networking equipment uses.
What is the difference between Hibernate and Standby in Windows XP?
Hibernate and Standby are two different sleep options offered in Windows XP.
Hibernate saves an image of your desktop, including all open windows and files. Then it powers down your computer just as if you had turned it off. When you turn your computer on again, your windows and files are open just as you left them.
Standby is a more traditional sleep mode, as it reduces the power your computer uses to almost nothing. When you select Standby, the power to your screen, hard drive, and peripheral devices is cut. However, the power to the computer's memory (RAM) is maintained so your open files stay open.
Hibernate saves an image of your desktop, including all open windows and files. Then it powers down your computer just as if you had turned it off. When you turn your computer on again, your windows and files are open just as you left them.
Standby is a more traditional sleep mode, as it reduces the power your computer uses to almost nothing. When you select Standby, the power to your screen, hard drive, and peripheral devices is cut. However, the power to the computer's memory (RAM) is maintained so your open files stay open.
What does a server do?
A server is a computer that serves information to other computers. These computers, called clients, can connect to a server through either a local area network (LAN) or a wide area network (WAN), such as the Internet.
There are a number of different types of servers, including Web servers, mail servers, and file servers. A web server serves Web pages to computers that connect to it. It also can parse scripting languages such as PHP, ASP, and JSP. A mail server stores users' e-mail accounts and sends and receives e-mail messages. For example, when you send an e-mail to a friend, the message is sent by a mail server, using the SMTP protocol. A file server is a computer that stores files that can be accessed by other computers. File servers are often used within local networks and typically require a password or some kind of authentication to connect to it.
These are a few examples of some common servers, but several other types of servers exist. Just about any computer can be used as a server if the necessary server software is installed on it. While servers typically don't need a lot of processing power, lots of RAM and fast hard drives are helpful for dealing with heavy traffic to and from the server.
There are a number of different types of servers, including Web servers, mail servers, and file servers. A web server serves Web pages to computers that connect to it. It also can parse scripting languages such as PHP, ASP, and JSP. A mail server stores users' e-mail accounts and sends and receives e-mail messages. For example, when you send an e-mail to a friend, the message is sent by a mail server, using the SMTP protocol. A file server is a computer that stores files that can be accessed by other computers. File servers are often used within local networks and typically require a password or some kind of authentication to connect to it.
These are a few examples of some common servers, but several other types of servers exist. Just about any computer can be used as a server if the necessary server software is installed on it. While servers typically don't need a lot of processing power, lots of RAM and fast hard drives are helpful for dealing with heavy traffic to and from the server.
Which is faster -- Kbps or Mbps?
Kbps stands for "kilobits per second," while Mbps stands for "megabits per second." Because one megabit is equal to 1024 kilobits, 1.0 Mbps is over 1000 times faster than 1.0 Kbps.
Note that the lowercase "b" in Kbps and Mbps means "bit," not byte. One byte is equal to eight bits. For example, 2 MBps equals 16 Mbps. This is a small but important difference to be aware of. Data transfer rates are typically measured in bits, while data storage capacity is usually measured in bytes.
Note that the lowercase "b" in Kbps and Mbps means "bit," not byte. One byte is equal to eight bits. For example, 2 MBps equals 16 Mbps. This is a small but important difference to be aware of. Data transfer rates are typically measured in bits, while data storage capacity is usually measured in bytes.
What is Copy and Paste and how does it work?
Copying and pasting is one of the most useful capabilities of your computer. When you select text in a document, you can often copy the selection and paste it somewhere else. This helps you aviod the monotonous re-typing of large sections of text.
Your computer's operating system (Windows, MacOS, Linux, etc.) has what is called a "clipboard" where it stores copied objects. Because the clipboard is controlled by the operating system, you can copy and paste text between applications. Not only can you copy and paste text, but you can copy and paste images and even actual files.
Because one program may allow for different formatting of text than another, when you paste text may not be the same as what you copied. For example, you may copy a phrase from Microsoft Word that is in bold type, uses the Verdana font, and is size 16 pt. If you paste it in your system's Notepad, it will appear as regular, unformatted text. Because Notepad doesn't support text-formatting, it will accept the text from the clipboard, but not the formatting. Copying and pasting images between programs may also yield similar results.
You can also "cut" text or an image from a document. This is the same as copying it to the clipboard, but it also removes the object from the document at the same time.
Your computer's operating system (Windows, MacOS, Linux, etc.) has what is called a "clipboard" where it stores copied objects. Because the clipboard is controlled by the operating system, you can copy and paste text between applications. Not only can you copy and paste text, but you can copy and paste images and even actual files.
Because one program may allow for different formatting of text than another, when you paste text may not be the same as what you copied. For example, you may copy a phrase from Microsoft Word that is in bold type, uses the Verdana font, and is size 16 pt. If you paste it in your system's Notepad, it will appear as regular, unformatted text. Because Notepad doesn't support text-formatting, it will accept the text from the clipboard, but not the formatting. Copying and pasting images between programs may also yield similar results.
You can also "cut" text or an image from a document. This is the same as copying it to the clipboard, but it also removes the object from the document at the same time.
Wednesday, September 30, 2009
What are kibibytes, mebibytes, and gibibytes?
The size of computer data is measured in bytes. Larger units of bytes are often measured in kilobytes, megabytes, and gigabytes. However, the size of these units can be somewhat ambiguous. For example, a kilobyte can equal 1,024 bytes or 1,000 bytes, depending on the context in which it is used. A megabyte may equal 1,048,576 bytes or 1,000,000 bytes.
In 1998, the International Electrotechnical Commission (IEC) introduced new units of measurement to avoid this confusion. These units are all exact measurements and cannot be estimated like kilobytes, megabytes, and gigabytes. The new IEC units are listed below:
1. byte (B)
2. kibibyte (KiB) - 2^10
3. mebibyte (MiB) - 2^20
4. gibibyte (GiB) - 2^30
5. tebibyte (TiB) - 2^40
6. pebibyte (PiB) - 2^50
7. exbibyte (EiB) - 2^60
8. zebibyte (ZiB) - 2^70
9. yobibyte (YiB) - 2^80
For a list of the more commonly used, but also more ambiguous SI units of data storage, view this article.
In 1998, the International Electrotechnical Commission (IEC) introduced new units of measurement to avoid this confusion. These units are all exact measurements and cannot be estimated like kilobytes, megabytes, and gigabytes. The new IEC units are listed below:
1. byte (B)
2. kibibyte (KiB) - 2^10
3. mebibyte (MiB) - 2^20
4. gibibyte (GiB) - 2^30
5. tebibyte (TiB) - 2^40
6. pebibyte (PiB) - 2^50
7. exbibyte (EiB) - 2^60
8. zebibyte (ZiB) - 2^70
9. yobibyte (YiB) - 2^80
For a list of the more commonly used, but also more ambiguous SI units of data storage, view this article.
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