First check the hard drive jumpers and be sure it is set to "Master" Second be sure the hard drive is connected/seated properly. Last if an installation disk came with the hard drive insert it into your media drive as hard drives remain un-notice until they are formatted. *you can also use a program such as Norton's Ghost to format the new drive.
I'm not sure exactly what the question is. If it loads Windows, obviously the hard disk WAS detected. Still, it may be a faulty motherboard or a failing hard disk or a corrupted installation of Windows or something. You may want to get it checked out by calling tech support.
If you are trying to install xp, you have format the hard drive prior installation. If you trying to reinstall Vista, check your hard drive for bad sectors. Make sure that the installation CD/DVD is readable (just try to copy all content on your hard drive).
A clean installation is a installation where the hard drive is reformatted and windows is installed fresh from the DVD or CD it came from.
During installation, Windows 7 will need about 16GB on a hard drive.
Use Acronis.
Windows Vista laptops will only be available on the second hand market. In addition, it will be difficult to obtain drivers for a modern laptop that officially support Windows Vista. It is even hard to find a Windows 7 powered computer, as Microsoft is pushing Windows 8 hard, despite its unpopularity.
sysprep.
How do i prepare a new hard disk drive for installation of a windows 98 system
You can't; there's nothing to install it to.
The BIOS will inform CMOS when there is a new installation with auto detection.
Not all portable hard drives work with every laptop. Some portable hard drives are formated for specific types of laptops. For example a portable hard drive that is formated for a Mac cannot be used with a windows laptop
Simply insert the installation disk and follow the prompts.