The first thing to consider when upgrading your hard drive is the size and speed of the new drive. See this article for the top internal hard drives (lower section for notebook/netbook 2.5" drives). When choosing mine, I wanted something spacious and fast, so I settled on the Seagate 500GB 7200RPM Momentous 7200.4 2.5” hard drive. It is the only drive, at the time of this writing, in the 7200RPM class to offer 500GB, the next largest size is 320GB. As this drive will up an upgrade to your current drive, I would recommend a new drive in the 320GB, 400GB, or 500GB range at either 5400RPM or 7200 RPM, whichever fits your budget. 7200RPM drives are noticeably faster than 5400RPM drives, but are more expensive. A good hard drive of these specs will usually run you about $60 - $120. To replace your hard drive, consult the owner’s manual. Again, you usually start by removing a few screws on the underside of the laptop and removing a panel to gain access to the inside. Once inside, the hard drive usually sits in a little compartment and once the holding screws are removed, it can slide right out. Unlike a desktop, there are no cables to plug in. The drive slides right in to connect the SATA data cable and SATA power connector. If you have a express-card solid state disk, then there are a few aftermarket options that are larger and a bit faster that are specifically designed to plug right into the express card slot.
An alternative to a classic hard disk drive is a solid state disk (SSD). These are the latest and greatest in storage, but read our article to find out if they are worth it. They use fast flash memory (like RAM) to store your data. These drives are very expensive but mean near instant load and boot times because there are no spinning and moving parts to recall data. Things happen in an instant. These run in the $100 - $800 price range and come in a variety of drive capacities and speeds. In addition to lighting fast load times, they run cooler, have longer predicted life spans (due to the lack of moving parts), and can greatly increase your battery life.