Here are some more information for Control Port:

Closing Vulnerabilities With Port Control

Port control is an essential security precaution today due to the millions of flash drives in use worldwide. The number of security breaches reported has risen almost dramatically with many breaches coming from flash drives. To properly protect a network against breaches port control must be in place. Flash drives must be controlled from a central control server. Without central control unauthorized flash drives could not only access data but viruses can be uploaded into the network also. This kind of a breach to security could compromise or corrupt data and end up costing the company a great deal of money to rectify.

Central Port Control Enhances Security

Port control is necessary if access to the network is to be monitored and security breaches eliminated. Fact is most companies have no more then physical control over their flash drives. However, compromised data can force a company to spend thousands of dollars in order to restore a security system to an effective level. If an attempt is made to corrupt data port control from a central server can detect and stop a possible virus from infecting the operating system. SanDisk Enterprise offers products that enhance port control and can be operated from a central control server.

Port control with central control puts the access control back in the hands of security personnel. If a drive is compromised, lost or stolen the flash drive can be terminated instantly with central control. Having this kind of port control virtually eliminates any further security threat that may be posed by the unauthorized access. Having this kind of central management capability is important to corporations, governments and businesses. Port control can avert the compromise and dissemination of information can be stopped with a central control system like the one produced by SanDisk Enterprise.

SanDisk Port Control

Port control from a central control system was developed by SanDisk Enterprise for the companies that need the most advanced security available. The protection of data during transportation and transmission prompted the incorporation of the most advanced security protocols available. Port control with central control over flash drives is fast becoming the standard of the modern information based business. The options that central control provides present very effective security measures. Port control with its enhanced security features protects more data keeping it safe from breaches, thefts and corruption with central control systems.

Port control really makes the most security sense for a company with multiple USB drives being used to store confidential data. If a company is going to issue flash drives, secure or not to its employees then the company should have control over the drives. This means more then just the physical control to withhold them but also to be able to exert port control and deny access. Many drives are lost and stolen and if port access is available the potential for a breach can occur. Port control would eliminate the potential breach by terminating the drive from the central server. Through termination the drive no longer has access to the operating system or host.

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How to control Bipolar stepper motor using parallel port?

I have extracted a stepper motor of reading head from CD ROM drive. It controls the linear motion of the head. But can any body help me to teach the basics of controlling this motor. It has four wires and i want to control it with parallel port. Is it possible to connect the motor with parallel port directly, without using any resistors, transistors and capacitors? Please help me I need to know this for my project work..

No, you'll need some kind of driver between port and motor as the port can supply only a very small amount of current. But it can be as simple as a single chip with multiple transistors, such as -

http://electronics-diy.com/stepper_motors.php

However, this circuit won't quite work with your motor - yours has 4 wires, which probably means that it is a 2-winding bipolar type, which requires a full-bridge drive. See

http://www.cs.uiowa.edu/~jones/step/types.html

A full-bridge drive has a high and a low side, which complicates things a bit. See the "Practical bipolar driver" section of

http://www.cs.uiowa.edu/~jones/step/circuits.html

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