You can't simply swap the drives between the laptops without a significant amount of rework needed. The Hard Drives are probably the same physical size and would physically "Connect" in either laptop fine. But each hard drive is software built upon the hardware it was initially configured in. You would have to reformat the Toshiba hard drive then rebuild it by loading the OS, drivers, and everything else on it.

If you are thinking about doing a Hard Drive swap, just get a new hard drive since you will have to do all of the software rebuilding stuff on it anyway. This all assumes that you still have the OS and driver software for your Dell laptop. You can download most of the specific laptop drivers off of the Dell website, but you need to produce the Windows OS CD/DVD and license keys to load the OS on the new hard drive. If you are not up for that, then you can have a computer store do it for you but by the time you purchase a new hard drive and pay someone the labor and software to make the new hard drive work, you could have simply bought a whole new laptop for less money.

Unfortunately, laptops these days are pretty much disposable items given how cheap they are. You might be better off spending $250 - $300 on a new laptop.