H: is mapped to your home directory on the file server which is reliable and does backups. The
Desktop is mapped onto
H:, but many other Windows app directories are copied back and forth from/to the file server when you login/out.
Under our Linux systems there are four ways to save data. Some of them
are only intended for temporary storage and should not be used for
data which is critical.
This is your home directory. It is the only place to
store data which you wish to keep. Your home directory is saved by
the backup system every night, but you have a limited amount which can
be saved here. (To see how much you have saved and how much you are
allowed to save, use the
quota(1M) command. For more
information, see below.)
Scratch uses the data area which remains on the hard disk of
the local machine after after all other necessary items are installed
on the disk. It is the right place to store large quantities of data
which have been downloaded from the Web, or temporary files which are
produced during the solution of a laboratory exercise.
The scratch area is not backed up, and its contents will be erased
automatically when it begins to become full.
This area may be called a shared scratch. Use this area
when you need to save something which should be accessible from a
different computer from that which you are using right now; for
example, if you want to install a somewhat larger program which does
not fit in your home directory.
These are the wrong places to save large quantities of
temporary data. This space is used by applications to save temporary
data; if it becomes full these applications will function poorly or
not at all. Therefore, do not use this area for other purposes than
quick storage of smaller amounts of temporary data. This directory is
emptied with each boot of the machine and older files are purged
automatically while the system is running.
Space in your home directory
The space which a student is allocated in the home directory is
based upon the number of courses which that student is
currently enrolled in. At this moment, the following limits apply.
A base limit of 300MB
A variable limit of 75MB per course
A max limit of 1700MB
For example, a new student which hasn't registered on any course gets 300MB quota. A student who is on his/her 2nd year (has read approx. 8 courses) gets 300MB + 8*75MB = 900MB.
For employees, quotas are used as a practical measure, to protected
against runaway programs which would otherwise fill the disk with
garbage. If you run out of space, speak with a system administrator
to solve the problem.