Nowadays, a modern PC, supplied with a large hard drive with Windows XP/Vista 64 bit and other applications pre-installed, is generally pre-configured either as one hard large partition or made up of a number of smaller partitions, which will bring you some kinds of trouble more or less, like system partition out of space with slower PC speed, low disk space warning popping up now and then.
Frustrating for all, however, for computer users like you and me, one of the best things to get more storage space and better performance out of the PC/server is to partition your hard disk reasonably for your Windows XP/Vista/Server 2003 64 bit.
Although you can change partition size your hard disk without a 64 bit partition manager (by using the DOS), it means backing up your entire system, and essentially deleting the existed partitions, and recreate new partitions as you desire, and then restoring all of your data and reinstalling applications to new partitions, which, I think, obviously is not the most acceptable choice for you to change partition size of hard drive under Windows XP/Vista/Server 2003 64 bit.
Instead, some partition managers 64 bit like EASEUS Partition Master that can change/resize partitions on the hard drive, making one bigger at the expense of the other without data loss on either achieves the same end without wiping out your hard disk, and generally gives you much more control with much less effort.
EASEUS Partition Master is 64 bit partition manager software that will enable you to change the size of your internal hard drive or external hard drive under Windows XP/Vista/Server 2003 64 bit, like extend system partition, resize/mover partition, create new partition, etc.
Apart from changing partition size, it also enables you to copy partition or disk to protect your data 100% security, format partition, convert FAT32 to NTFS, even copy dynamic disk to basic disk to resize it, which absolutely offers you the safest way to resize dynamic disk. Download it now and follow the step by step instructions to change partition size with partition manager for Windows XP/Vista/Server 2003/2008 64 bit.