> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/extender-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/extender-manual/extender-quick-start/formatting_sd_card.md).

# Formatting SD Card

To record data to your Extender, you need to purchase, install and format a microSD card. The SD card must be between 4-32GB and formatted with FAT32.

*Note: SD card not included with Extender.*

Below are the instructions for formatting the SD card on Windows and Mac.

## Windows

Power on Extender, insert the card into Extender and plug Extender into your PC.

Right click on Extender driver and select format.

![](https://882260898-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LIeRq11UI35TJTLmMuf%2F-LIeRvZqQ-3KpVzLxzyQ%2F-LIeRxETCDzqc1W9ZVJd%2Fformat.png?generation=1532941817329168\&alt=media)

Specify as FAT32 and press "Start" to format.

![](https://882260898-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LIeRq11UI35TJTLmMuf%2F-LIeRvZqQ-3KpVzLxzyQ%2F-LIeRxEVv_RJIF_ACP7b%2FStart.png?generation=1532941822811371\&alt=media)

Your drive should now be ready for recording.

## Mac

Power on Extender, insert the card into Extender and plug Extender into your Mac

Press command + space and type "disk utility". Open the Disk Utility setting window.

![](https://882260898-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LIeRq11UI35TJTLmMuf%2F-LIeRvZqQ-3KpVzLxzyQ%2F-LIeRxEX-OQU-xdPkbHB%2FScreen%20Shot%202018-02-07%20at%203.41.26%20pm.png?generation=1532941821893241\&alt=media)

Partition or erase the disk and select the partition format as MS-DOS (FAT)

![](https://882260898-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LIeRq11UI35TJTLmMuf%2F-LIeRvZqQ-3KpVzLxzyQ%2F-LIeRxEZRDllLhC_qcF_%2FScreen%20Shot%202018-02-07%20at%203.41.39%20pm.png?generation=1532941821927144\&alt=media)

Press ERASE

![](https://882260898-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LIeRq11UI35TJTLmMuf%2F-LIeRvZqQ-3KpVzLxzyQ%2F-LIeRxEaFMJKckOyiXir%2FScreen%20Shot%202018-02-07%20at%203.41.49%20pm.png?generation=1532941822849998\&alt=media)

Your disk should now be ready for use in Extender.