Mac Mini Needs more room

Question

Hello, This is my first post.
Can someone advise me on the best course of action? My Mini keeps telling me that I need more room on my startup disk. What should I do?
I keep deleating files (podcasts, pictures, etc.) but it does it again within a few more days. This is also making my mini slow down. I thought about getting an external hard drive, but was not sure if that would take care of the problem.
Any Suggestions?
Thank you in advance.

Answer 1

I ran the Mac Janitor --
When I click on the HD in my finder, it says 19.98gb available.
This is the information from my system profiler:
Hardware Overview:
Machine Name: Mac mini
Machine Model: PowerMac10,2
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.33 GHz
L2 Cache (per CPU): 512 KB
Memory: 512 MB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.4f0
Memory --
DIMM0/J11:
Size: 512 MB
Type: DDR SDRAM
Speed: PC3200U-30330
Status: OK
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 30
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 30
Sleep On Power Button: Yes
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On LAN: Yes
Wake On Modem Ring: Yes
ATA Bus:
ST9402115A:
Capacity: 37.26 GB
Model: ST9402115A
Revision: 3.01
Serial Number: 3NV00LKN
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Protocol: ATA
Unit Number: 0
Socket Type: Internal
OS9 Drivers: No
S.M.A.R.T. status: Verified
Volumes:
Macintosh HD:
Capacity: 37.13 GB
Available: 16.98 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk0s3
Mount Point: /
MATSHITACD-RW CW-8124:
Model: MATSHITACD-RW CW-8124
Revision: DACD
Serial Number:
Detachable Drive: No
Protocol: ATAPI
Unit Number: 1
Socket Type: Internal
Again, thank you for your help.