One major improvement that was made in Windows 7 was the ability to free up space quicker. Disc Utility has evolved to delete files while backing up files.
df df - report file system disk space usage du du - estimate file space usage
GNOME Disk Usage Analyzer
A disk space analyzer is a software utility for the visualization of disk space usage by getting the size for each folder (including sub-folders) and files in a folder or drive.
windows
It is the total amount of storage space consumed on the disk. In web hosting, its the total amount of storage space you are using, HTML files, images, logs, etc.
I'm not sure what you are referring to by "disk management." There are many utilities to check disk usage, delete files, and manage space quotas.
partition
If I recall, XP can utilize a maximum of 2Gigs of RAM. I do not think there is any limit to the disk space.
edquota -u username
The disk size is defined by the manufacturer. You can't store more information than the disk can hold, just like you can't store more water in a jar that it can hold.
It depends on which version of Windows. Windows Vista requires around 8GB of install space, Windows XP requires around 2.5GB. Older versions such as 98 and 2000 only need around 200-500MB. Windows 95 can install in only 50Mb of hard disk space. Ideally, you would need to double these figures just to get a useful system up and running.
Windows xp supports a maximum of 4 gigabytes of ram and 2 Terabytes of hard drive space