# Format the SD Card

The filesystem must be correctly prepared before using an SD Card in a Logger; you can do this via the 'Format SD Card' function.

Click the 'Format SD Card' button. ![](/files/U1MThqaJ5Xn0O3COozzv)

Formatting the SD Card will erase all the SD card data, so you will be asked if you wish to Format the SD card. To confirm, press 'YES'.

![](/files/u1Jc4P2IyJKJBWt6wgKk)

You will be presented with the Format window with the correct Capacity, File System, and Allocation unit size options selected. DO NOT CHANGE THESE; press Start to format the SD Card.

![](/files/UJft0JFhlvUfOck95lmk)

Confirm once more that you want to erase ALL data on the SD Card by clicking 'OK'.

![](/files/Oqrzyp6xiTW4RvE0w3GG)

You will be informed that the format operation is complete; press 'OK' to acknowledge that.

![](/files/wWO5p3sysGPmchgTn77Z)

Exit from the Format Window by pressing 'Close'.


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