If you are planning to upgrade the size of your hard drive in a Mac running Mountain Lion, then first you'll need to make sure:
(1) Time Machine has backed up your latest files (the whole system, don't exclude the system files or applications)
(2) you've downloaded the OS X Recovery Disk Assistant and installed it onto a thumb drive. To do this: (i) download the OS X Recovery Disk Assistant, (ii) with the thumb drive plugged into your USB port open the .dmg and run the program (don't copy the .dmg or the application to your thumb drive, OS X does all it needs to when you select it as the target). Note: if the drive isn't OS X Extended (journaled) format then you'll need to use Disk Utility to erase the contents and format it before installing the recovery software
(3) when that's all done shut down your Mac, unplug it and put the new drive in
(4) plug the thumb drive in and power it up
(5) plug your Time Machine drive in and select "Restore from Time Machine backup"
(6) Next go to the Utility menu and open Disk Utility, then select the erase tab and format the new drive you just put inside your Mac as OS X Extended (journaled)
(7) Now the drive should appear where formally it said "Searching for Disks ... " or such like
(8) Follow the instructions to continue, and after a while your Mac will be restored with extra gigabytes of memory
(1) Time Machine has backed up your latest files (the whole system, don't exclude the system files or applications)
(2) you've downloaded the OS X Recovery Disk Assistant and installed it onto a thumb drive. To do this: (i) download the OS X Recovery Disk Assistant, (ii) with the thumb drive plugged into your USB port open the .dmg and run the program (don't copy the .dmg or the application to your thumb drive, OS X does all it needs to when you select it as the target). Note: if the drive isn't OS X Extended (journaled) format then you'll need to use Disk Utility to erase the contents and format it before installing the recovery software
(3) when that's all done shut down your Mac, unplug it and put the new drive in
(4) plug the thumb drive in and power it up
(5) plug your Time Machine drive in and select "Restore from Time Machine backup"
(6) Next go to the Utility menu and open Disk Utility, then select the erase tab and format the new drive you just put inside your Mac as OS X Extended (journaled)
(7) Now the drive should appear where formally it said "Searching for Disks ... " or such like
(8) Follow the instructions to continue, and after a while your Mac will be restored with extra gigabytes of memory
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