by Bob » Thu Nov 13, 2008 5:17 am
If you are that short of space on C:\, you should definitely do some cleanup on that drive regardless of where you install CS4. It used to be a rule of thumb that 20% of the C:\ drive should be free space. That's probably overly large given the size of currently available disk drives, but the basic principle is sound. A lot of stuff gets written to the C:\ drive including temporary files and the system cache files. Not to mention the system page file. Too little space can cause problems. You can certainly install CS4 to another drive. But, keep in mind that some things will need to be written to c:\ anyway. Some of it in system folders and the registry and some in your Documents folder.
Back in the early days of DOS and Windows, there was an advantage to separating the OS and the applications. But, with Windows XP and Vista, it can be argued that there is no longer any real advantage. The registry resides on c:\ and the local configuration/properties/preferences files and temporary files are generally there as well. Both operating systems also cache frequently used modules to the c:\ drive anyway. And, you'll still need to reinstall your applications if you have to format and reinstall the OS. Then there is the issue that some applications may make assumptions about where things are installed and some even hard code in specific file paths. Also, some of the backup programs that typically come with external drives may only backup the c:\ drive and restores can get the application and registry out of sync. It's probably easier all around to install everything on the c:\ drive.
It is advantageous to store the data on a separate drive. Especially for high disk access applications such as video.