Built into Mac OS X is an application called Disk Utility, which can format and partition any internal or external volume. It's located in /Applications/Utilities/. Additionally, there are some third-party utilities that can work with partitions on-the-fly: iPartition, DiskWorks, and VolumeWorks all claim to do this.
If you created more than one partition on startup disk then you should backup all the information on that disk before going any further. Restart the Mac from the Operating System Install disk, and use the Disk Utility program to remove the extra partition. Most Mac people find the only reason they need more than one partition is when installing Windows and / or Linux on the Mac startup disk.
To remove a partition on a slave hard drive you can go into the BIOS. You should look up a guide if you plan to do this.
In general, there is no reason to have more than one partition on an external hard drive. There are some specific cases where it might be desirable but you would know if you had a requirement like that.
There are several tutorials on YouTube which will show you exactly how to remove a partition. Removing a hard drive partition on Windows Vista will create an empty space that you can use to install a new partition. Be aware that it will also delete all data that is on the partition.
Modern disk drive construction more or less requires drives to have at least one partition. Whether the drive is internal or external is immaterial.
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You can certainly move Windows to an external hard drive but Windows will not boot directly from an external drive. If you are running Windows in Parallels (See links below) you can have Parallels installed on the Mac's drive and then have your Windows virtual machine on the external drive.
The system partition(a partition where the operating system is installed) is the active partition of the Hard Drive
The ability to partition hard drives can provide a range of benefits. But removing a hard drive partition can be difficult if you don't know what you are doing. With a few simple steps, this article will show you how easy it is to remove a hard drive partition without losing information or potentially damaging your drive or OS installation.
my computer--->manage->computer management ---->select drive drive and right click delete partition
In order to remove a external hard drive one must first disconnect it from the the computer by clicking through the hard dives and entering the options and disconnecting.
There are many ways, but the easiest is to use a Windows 7 installation disk to delete the partition.
system partition