And always use portable drive to install before internal hard drive. For Realtek id 0139 card reader isn’t supported, a USB SD card reader is handy.
The best way to install Snow Leopard or Lion to Laptop internal hard drive is restore it instead of install it with MBR flag. Always install Mac OS X on external USB drive, experiment with it, install all the software and test out all functions, then restore the whole image to the internal hard drive. Remember 3 things:
1. Make sure the external usb hard drive is bootable to Snow Leopard or Lion.
2. Snow Leopard can restore from the source to hard drive partition.
3. Lion DOES NOT allow restoring from the source to hard drive partition, must boot with unibeast installation usb, then select disk utilities and restore from there.