Install the 27x0210 hard drive on a xm5163 - Lexmark Hard Disk Drive 160 Gb [27X0210]

PDF]My Passport User Manual - Western Digital

www.wdc.com/.../4779-70...
WESTERN DIGITAL TECHNOLOGIES INCUSER MANUAL. ABOUT YOUR WD DRIVE - 1. About Your WD Drive. Welcome to your My Passport® portable hard drive, an elegant, high-capacity storage.

Could you be more specific why you can't use your external drive? Maybe it's not correctly installed?

Check steps:
How to Install Portable Hard Drive on Your Computer

http://www.viewletcentral.com/vc/viewlet/644712977

How To Install Windows 7 To USB External Hard Drive Must Read

How to Install an External Hard Drive

In service test menu scroll to "3.Hard disc drive", & press enter, if test drive passed don't replace the hard disc or modification or changes. If test failed then check as shown below:
1 Switch the printer OFF. Remove the EIO Card (if installed) and re-install the Hard Disk Drive making sure it installed correctly by pushing it firmly inwards and checking that the two installation screws are completely tightened. Switch the printer ON again and repeat the Hard Disk Drive Test. If the Hard Disk Drive Test fails again then replace the Hard Disk Drive.
2 If the Hard Disk Drive Test passed after removing the EIO Card,then switch the Printer OFF and reinstall the EIO Card, making sure that the two installation screws are completely tightened.
Switch the Printer ON again and repeat the Hard Disk Drive Test. If the Hard Disk Drive Test fails, then the EIO Card could be faulty.Replace the EIO Card.
3 If the Hard Disk Drive Test continues to fail after replacing the EIO card or the Hard Disk Drive, then replace the Electronics Module..
I am having little knowledge, if I am wrong Pl don't comment, pl forgive me.

If your ASUS laptop uses a SATA hard drive -

SATA HARD DRIVE - XP INSTALLATION
The problem is that XP installation CD does not have a SATA driver, unless you have a SATA drive on a disk etc. and can install the driver when XP asks for a hard drive driver then, XP cannot detect the hard disk and therefore won't install XP. The FIX. Go into the BIOS and disable the SATA drive (enable IDE emulation), this will make XP think it is a IDE/PATA hard disk. Then you can install XP normally. When Windows has been installed then install all the device drivers (including the SATA driver), then shut down and boot up and got into the BIOS and enable the SATA drive.

SATA HARD DRIVE - XP INSTALLATION
The problem is that XP installation CD does not have a SATA driver, unless you have a SATA drive on a disk etc. and can install the driver when XP asks for a hard drive driver then, XP cannot detect the hard disk and therefore won't install XP. The FIX. Go into the BIOS and disable the SATA drive (enable IDE emulation), this will make XP think it is a IDE/PATA hard disk. Then you can install XP normally. When Windows has been installed then install all the device drivers (including the SATA driver), then shut down and boot up and got into the BIOS and enable the SATA drive.

Install the hard drive to the computer if it is compatible with the computer and install your operating system, you cannot transfer and operating system from one hard drive to another.

you can use another installer coz maybe your installer have some scratches

Here is the quick guide to installing the new sata HDD.
http://www.easeus.com/resource/install-sata-hard-drive.htm

It means the install cannot see or detect the hard disk and is caused by :-
Incorrect BIOS setting for the hard drive.
or
A faulty hard drive.
or
The hard drive is not seated correctly on the hard drive connector.

Test the hard drive in another laptop or attach the hard drive to an USB hard drive adapter and plug it into a working computer's USB port, if it see the drive as an external drive and you can copy and delete files to this drive then it is OK and the fault is with the laptop.