Slackware :: Write Script For Crontab Hdd Operation?

I have this Maxtor USB external HDD which I mount via dolphin-hal when needed. This HDD has a built in feature to 'sleep' if not used for some time, say 20 min. Now I don't want it to sleep because it irritates me to wait everytime for it to be active for use, so I figured crontab job should fulfill my requirement.

*Edit: I think a script needs to be executed every 15 minutes. The script has to do the following(I think):

Check to see if HDD is conected via USB:
If YES then - Do the below things
If NO - Do nothing

"Below Things":

Check if the ext4 fs is mounted on media/Maxtor-C; if yes then check if any file operation is being performed; if yes-do nothing, if no then write and remove an empty file. if hdd is connected but not mounted then hdparm -z /dev/sdxx (read partitions)