BitLocker in Windows 7 has limitations on the size of USB drives that it can encrypt. Here are the maximum storage capacities supported for BitLocker encryption on removable drives in Windows 7: - Windows 7 Ultimate and Enterprise: You can encrypt any size of removable drive with BitLocker on these editions. - Windows 7 Professional: BitLocker on this edition can only encrypt a removable drive up to 4 GB in size. If you are using Windows 7 Professional, the maximum size of the USB storage device that BitLocker can encrypt is limited to 4 GB. For Windows 7 Ultimate and Enterprise, there are no such limitations, and you should be able to encrypt larger USB drives without any issues. If you are looking to encrypt a USB storage...