Decoding Cache for DJ-ing (mp3)

[J.D]

So i was Reading some other post on decoding cache cause my HD was 100% full & i spent 12 hours straight saturday loading windows & all my audio Progs to my faster drive. so i was like this can't be right, well i found out about the decoding cache & heres my quesition. Do you have to save those files in order to use all your mp3s to DJ or once you set your warp markers & get the track on time can you delete these?
cause i transferred all my mp3s to my D.A.W & was going to intergrate live in my DJ set up but if thats the cause then i need to buy another HD just for those files

any help would be great

thank you