How do I delete the data files that my students save to the LabQuest?

The easiest way to delete individual files is to use the LabQuest Browser in Logger Pro.
1. Connect the LabQuest and launch Logger Pro.
2. Choose LabQuest Browser --> Delete from the File menu. You'll see a list of files on the LabQuest.
3. Shift-click to select all the files you want to remove. Click Delete.

If you don't have Logger Pro available, you can use a tool right on the LabQuest:

Delete-mydata.lqu is a LabQuest update file that will delete all of the student-created data files (.qmbl) that have been saved to a LabQuest's internal memory. This is more convenient than choosing File / Delete for every file that students have saved over the course of a semester. This update will not affect stored lab instructions generated using My LabQuest Library.

To install, you will need to:
1. Download the file delete-mydata.lqu from http://www.vernier.com/til/files/2261/delete-mydata.lqu
2. Copy the file to a USB thumb drive or SD drive
3. Connect the USB/SD drive to a LabQuest
4. Tap On Home at the bottom of the screen, and choose Control Panel (original LabQuest) or System (LabQuest 2) and then choose System Information
5. Click "Update LabQuest"
6. Click on the USB drive or SD card icon
7. Select the file "delete-mydata.lqu"
8. Click "Update" to start the update. When prompted to install the update, select "Yes."
9. When the update is complete, close the System Information window.

http://www.vernier.com/til/files/2261/delete-mydata.lqu

Note: This updater will wipe everything in the data directory, but leave lab instructions intact. This includes subfolders of the data directory. Compatible with all LabQuest firmware versions including 1.0 and 2.0

Note also TIL 2203: Using the LabQuest Browser in Logger Pro reports "Error communicating with LabQuest: 1. Cannot browse device." and disconnects. If the LabQuest has too many files for Logger Pro to display, you will have to use the tool on LabQuest to delete files.