All I know is tht SSD's these days come in the 2.5" size........ so it will be difficult to get 1.8" SSD........
Also IMO....... u only buy an SSD when rest of ur h/w is better than the HDD........ i.e. if the HDD is becoming a bottleneck for the system...... only then buy an SSD......
I would recommend not buying an SSD bcoz of the 1.8" size...... since u wont be able to use tht SSD on any other PC or laptop later in the future........
Treat my opinion as just advisory since I dont know anything abt Dell Mini 12.......