# Flashed USB with StartOS "unmountable" on MacBook?

**URL:** https://community.start9.com/t/flashed-usb-with-startos-unmountable-on-macbook/1113
**Category:** DIY Community
**Created:** [February 9, 2024, 1:04am UTC](https://community.start9.com/t/flashed-usb-with-startos-unmountable-on-macbook/1113 "2024-02-09T01:04:31Z")
**Posts on this page:** 1
**Showing post:** 10

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### Author: ![WheelsSpinning](https://community.start9.com/letter_avatar_proxy/v4/letter/w/ec9cab/32.png) [@WheelsSpinning](https://community.start9.com/u/WheelsSpinning)
#### Post date: [March 2, 2024, 7:57pm UTC](https://community.start9.com/t/flashed-usb-with-startos-unmountable-on-macbook/1113/10 "2024-03-02T19:57:56Z")

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Thanks for the recommendations Stuart

I tried both your suggestions with the same result / error message as before.  
RPC ERROR: Disk Management error mkfsvfat: unable to open /dev/nvme0n1p1

I re-installed the Mac OS before trying each option

On option 2, I used UBUNTU in the try mode versus install and ran the commands as recommended.

I did this twice because I noticed that the disk name to select for install is named /dev/nvme0n1 and the error message was unable to open /dev/nvme0n1p1.

I sudo wipe’d /dev/nvme0n1 and got same error.

Reinstalled MacOS and went through it all and then did the sudo wipe on the “sub” /dev/nvme0n1p1

My MacBook Pro is on the list of hardware that has worked for to StartOS.

Any other thoughts?

 ![Error Message](https://community.start9.com/uploads/default/original/1X/33e2dcaee808da0966e79a099f29afa5edccaeaf.jpeg)  
 ![Wipe "main" drive nvme0n1](https://community.start9.com/uploads/default/original/1X/c3604dc8c612fa705ad5c8aeb12921f2227716c3.jpeg)  
 ![Wipe "sub" same name as error](https://community.start9.com/uploads/default/original/1X/29cad31072586973ac165b0dfadc84d3000de6a8.jpeg)

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_[View the full topic](https://community.start9.com/t/flashed-usb-with-startos-unmountable-on-macbook/1113)._