Updating hard drive macbook pro
The Mac Book Air is a little more limited, but you should be able to upgrade the SSD and battery.Fortunately, it's fairly easy to replace the hard drive. The first step is to clone your Mac's hard drive onto the SSD.For this, you can use a utility such as Carbon Copy Cloner, but we're going to show you how to do it with Apple's own Disk Utility program.You can swap out a dead Super Drive, for example, or a cracked screen for a replacement.
But it isn't possible to take advantage of an upgrade at the same time - you can't fit a higher-resolution screen, or upgrade to a more powerful battery, or swap your Super Drive for a Blu-Ray model (although it is possible to attach a USB Blu-Ray drive).
So, if you've an old Macbook, and are willing to do a little work, then a new HDD (or SSD) might be just what the doctor ordered…