No, they don't disappear, unless you use the command move to...
Internal Drive
Yes. Choose to save documents you're working on to the external drive, and they will not be saved on your internal drive. Be careful, though, Microsoft Office does cache files locally, in case of a power failure or crash to save your progress, and these may possibly be recovered from an internal drive. Your external drive should be given a drive letter, D:, E:, F:, etc.
An internal hard drive will generally be faster than an external one.
External. Internal devices would be something like a CD Drive, while an external device is a keyboard or mouse for example.
There are two types of drives, either internal or external. An external drive would only offer external storage. It is kept internally on the external drive but that is all.
There are external and internal hds
They make internal and external 500 gb HDD
No, you have to also delete what you want from the external hard drive. Remember, an external hard drive is just like a internal one. So, for example, if you delete picture a on the internal hard drive, that's all that is deleted. If picture a is also on the external hard drive (why would it be though), then you need to also delete it there.
easy to upgrade
In Windows operating systems, the drive letter (F in this example) is assigned to a logical partition of an internal, external or even virtual device, so it could stand for any of these.
An external drive is the same as an internal drive just not installed inside the case. Meaning you can use it in exactly the same way as an internal drive. A backup drive is usually a zip drive designed to back up you hard drive and isn't used as a hard drive itself. It is usually in the form simalar to a floppy disk that the backup information is copied to. You can then use the backup disk and drive to reinstall all of your information from your original hard drive back to the hard drive in case of a virus or manually removing something that was needed for the system to run.
without a hard drive your PC wouldn't work at all. so you must have a hard drive, whether its internal or external...