Swaping the hard drive from one laptop to another

None of this is guaranteed to work so backup all your data first. And if you have an OEM Widows licence it may not port to new hardware anyway.

The main problem is going to be device drivers. If the L505D has Win7 installed on its current hard disk you can use DoubleDriver (http://double-driver.en.softonic.com/) to backup the device specific device drivers, then run it again on the A200 to restore them onto the hard disk you want to migrate. Hopefully the hard disk will then boot up on the L505D, though it may take a reboot or two for everything to settle down.

Otherwise, go to the Toshiba support site and download all the drivers you can find for the L505D and put them on a memory stick. When you boot up the hard drive in the new laptop it'll find lots of unknown hardware, and you can point the hardware installation wizard at the memory stick whenever it asks for some drivers.