Not sure about the RAM part - though if you find out I'd be curious to know myself :>
Here's the best/easiest way to check your hard disk capacity - as root type 'df' (command to report filesystem disk space usage) on the command line.
For example:
[root@cr402706-a jay]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda6 3087568 1125316 1805412 39% /
/dev/hda1 11677 3266 7808 30% /boot
This is my home server which is a 3.5 GB disk; the important part is the first line /dev/hda6 which is the '/' filesystem:
- 39% used
Thankfully I have nothing to worry about for a long time :>
For more parameters, see 'man df'.
Regards,
Jay