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partition copy very slow

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I just purchased DD to copy a partition on one external usb drive to another partition on a 2nd drive connected to a different USB connection on the system.

I'm trying to copy a 160GB NTFS partition on an XP system. After running for 24 hours it's only 25% complete. Any suggestions why this is running so slow.

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Hello Bill,

Thank you for using [url="http://www.acronis.com/homecomputing/products/diskdirector/"]Acronis Disk Director Suite 10.0[/url] 

The program behavior is abnormal, the operation should take only several minutes.

To increase the performance please switch your external hard drive to "Optimize for performance" mode:
a. Right-click the My Computer icon and then click Manage.
b. Click the Device Manager icon.
c. Click the plus (+) sign next to Disk Drives.
d. Double-click the USB hard drive string.
e. Click the Policies button then click Optimize for performance and mark all checkboxes.
Compare the performance. Also I would recommend you to perform the operation under Acronis Bootable Rescue Media. 
Please log in to your account, go to the Registered products and downloads section -> Bootable media. Download the file (the serial number should be registered).
You can find more information on how to burn an ISO image to a CD here
Boot the system from this CD,  please check in your computer's BIOS if booting from removable media (CD-ROM) is allowed and switched on and execute the operation. Acronis Booting Rescue Media is based on a Linux operating system, the program will handle your hardware in a different way. 
Please do not hesitate to ask additional questions if the provided information is not clear or you need a further assistance. 

Thank you.