Q: How to restore the original partition after accidentally reformatting the windows 10 installation

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MouseUnderTheHouse

Level 1 (4 points)

Windows Software

Q: How to restore the original partition after accidentally reformatting the windows 10 installation

See problem below. I cannot get a USB stick formatted with FAT to be recognised by bootcamp either to download the drivers to proceed.

The problem occurred after my son wanted to re-install windows 7 after it was upgraded to windows 10 and used disk utilities to reformat the windows installed drive.

MacBook Pro, OS X El Capitan (10.11.1), Mac book is from 2010

Posted on Sep 24, 2016 7:44 AM

I have this question too

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Loner T

Level 7 (24,869 points)

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A:

The partition is now an HFS+ file system. You can remove it using BC assistant after reformatting it as FAT32 using the following OSX Terminal command.

diskutil eraseVolume fat32 BOOTCAMP disk0s4

this can also be done via DU UI.

Afree you remove it, reinstall W7/W10, as desired.

Posted on Sep 26, 2016 12:15 AM

Q: How to restore the original partition after accidentally reformatting the windows 10 installation

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by Loner T,

Loner T Sep 24, 2016 8:42 AM in response to MouseUnderTheHouse
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Sep 24, 2016 8:42 AM in response to MouseUnderTheHouse

From OS X Terminal, can you post the output of

diskutil list
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by MouseUnderTheHouse,

MouseUnderTheHouse Sep 24, 2016 11:41 AM in response to Loner T
Level 1 (4 points)

Windows Software

Sep 24, 2016 11:41 AM in response to Loner T

Is this it?
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by Loner T,

Loner T Sep 24, 2016 11:43 AM in response to MouseUnderTheHouse
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Sep 24, 2016 11:43 AM in response to MouseUnderTheHouse

Run Applications -> Utilities -> Terminal and type

diskutil list

Post the output as a reply. This output is much richer than the UI output from Disk Utility.
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by MouseUnderTheHouse,

MouseUnderTheHouse Sep 24, 2016 11:48 AM in response to MouseUnderTheHouse
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Sep 24, 2016 11:48 AM in response to MouseUnderTheHouse
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by MouseUnderTheHouse,Helpful

MouseUnderTheHouse Sep 26, 2016 12:15 AM in response to Loner T
Level 1 (4 points)

Windows Software

Sep 26, 2016 12:15 AM in response to Loner T

Thanks. It worked after I rebooted from EFI restore (I believe so anyway). Without the reboot it did not allow reinstall windows from bootcamp, but after it did. All sorted. Many thanks.
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by Loner T,

Loner T Sep 26, 2016 4:29 AM in response to MouseUnderTheHouse
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Sep 26, 2016 4:29 AM in response to MouseUnderTheHouse

Excellent. Please remember to back up OS X, Windows and create a Windows System Restore point.
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Accepted Answer · Sep 26, 2016 12:15 AM

Loner T

Level 7 (24,869 points)

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Sep 26, 2016 12:15 AM in response to MouseUnderTheHouse

The partition is now an HFS+ file system. You can remove it using BC assistant after reformatting it as FAT32 using the following OSX Terminal command.

diskutil eraseVolume fat32 BOOTCAMP disk0s4

this can also be done via DU UI.

Afree you remove it, reinstall W7/W10, as desired.

Q: How to restore the original partition after accidentally reformatting the windows 10 installation

All replies Helpful answers

by Loner T,

by MouseUnderTheHouse,

by Loner T,

by MouseUnderTheHouse,

by Loner T,Solvedanswer

by MouseUnderTheHouse,★Helpful

by Loner T,

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by MouseUnderTheHouse,Helpful