# What is the "o" drive? **URL:** \ **Category:** General Chat\ **Tags:** ex-controller\ **Created:** [August 4, 2026, 6:38pm UTC](https://forum.avidcnc.com/t/what-is-the-o-drive/6408 "2026-08-04T18:38:36Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![DaveWierenga](https://avatars.discourse-cdn.com/v4/letter/d/34f0e0/32.png) [@DaveWierenga](https://forum.avidcnc.com/u/DaveWierenga)\ **Post date:** [August 4, 2026, 6:38pm UTC](https://forum.avidcnc.com/t/what-is-the-o-drive/6408/1 "2026-08-04T18:38:36Z")
When loading a file from a thumb drive, I get a notice that the file exists on the “O” drive. should I use the “O” drive file or the file on my thumb drive? ---
**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\ **Post date:** [August 4, 2026, 6:40pm UTC](https://forum.avidcnc.com/t/what-is-the-o-drive/6408/2 "2026-08-04T18:40:51Z")
You’ll have to be a little more specific.. not sure what you’re getting at here… ---
**Author:** ![DaveWierenga](https://avatars.discourse-cdn.com/v4/letter/d/34f0e0/32.png) [@DaveWierenga](https://forum.avidcnc.com/u/DaveWierenga)\ **Post date:** [August 7, 2026, 10:08pm UTC](https://forum.avidcnc.com/t/what-is-the-o-drive/6408/3 "2026-08-07T22:08:15Z")
My error. I read the C drive as O. Another question, when does the thumb drive data get transferred to the C drive? ---
**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\ **Post date:** [August 8, 2026, 1:18am UTC](https://forum.avidcnc.com/t/what-is-the-o-drive/6408/4 "2026-08-08T01:18:14Z")
> [@DaveWierenga](#): > > when does the thumb drive data get transferred to the C drive? as soon as you load it it will be copied into CNC 12