When installing windows via Boot Camp, a usb is created which was used for installation.
Now that I have deleted the Windows partition, the usb is no longer needed.
The usb is called "WININSTALL" and a photo below are the files in the usb that can't be deleted.
MacBook Air (13-inch Mid 2013), OS X Yosemite (10.10.5)
Please see Question about my USB drive post-Boot camp .
Please see Question about my USB drive post-Boot camp .
Try formatting your usb with Diskutility. That will erase all the files. (Choose OSX Extended (journaled)).
This Doesn't work
Connect the USB to your Mac, and once connected post the output of the following OSX Terminal command.
diskutil list
You should see an entry for the USB. Note down the N in 'diskN' for it. Now you can run
diskutil eraseDisk jhfs+ MyUSB diskN
Please choose N correctly to ensure that you do not accidentally erase any other disk.
This doesn't work.
I tried eraseDisk, eraseVolume and reformat, these 3, but none of them worked.
Someone permission denied
It said:
Started erase on disk2s1 WININSTALL
Unmounting disk
Erasing
newfs_msdos: /dev/rdisk2s1: Permission denied
Mounting disk
Error: -69832: File system formatter failed
You need to erase an entire disk not a slice. Try
diskutil eraseDisk fat MyUSB disk2
Neither.
Started erase on disk2
Unmounting disk
Error: -69877: Couldn't open device
Please connect the USB, and post the output of
diskutil list
diskutil cs list
My usb is called WININSTALL
diskutil list: what comes out:
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *251.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 250.1 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +249.8 GB disk1
Logical Volume on disk0s2
33F90395-AEEE-40A8-8537-AB1F61C16E7C
Unencrypted
/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.0 GB disk2
1: DOS_FAT_32 WININSTALL 8.0 GB disk2s1
diskutil cs list: what comes out:
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 9E6DA4FC-5108-42EC-8A20-56C0805D068C
=========================================================
Name: Macintosh HD
Status: Online
Size: 250140434432 B (250.1 GB)
Free Space: 18882560 B (18.9 MB)
|
+-< Physical Volume B505C9AC-7F1A-41D5-866F-0A049DD0DC6B
| ----------------------------------------------------
| Index: 0
| Disk: disk0s2
| Status: Online
| Size: 250140434432 B (250.1 GB)
|
+-> Logical Volume Family BA69AB4F-CDE9-4F88-A842-4EB4C5023B57
----------------------------------------------------------
Encryption Type: None
|
+-> Logical Volume 33F90395-AEEE-40A8-8537-AB1F61C16E7C
---------------------------------------------------
Disk: disk1
Status: Online
Size (Total): 249769230336 B (249.8 GB)
Revertible: Yes (no decryption required)
LV Name: Macintosh HD
Volume Name: Macintosh HD
Content Hint: Apple_HFS
I was wondering why diskutil cs list command doesn't even mention disk2 ?
1. Unmount disk2
diskutil unmount disk2
2. Check if the disk is still the same
diskutil list
3. Erase the disk
diskutil eraseDisk fat MyUSB disk2
4. Check the disk
diskutil list
Since disk2 has no CS LV/LVG, it will not appear in the CS list output.
First step is successful
For further information, I only have the permission to read the disk, but I don't know why I can only read. This usb was made in Bootcamp assistant in my macbook.
In the third step it is sill like that:
Started erase on disk2
Unmounting disk
Error: -69877: Couldn't open device
Please look in Applications -> Utilities -> Console logs and look for any disk-related errors.
Question about usb drive made with Boot Camp
