# diskutil

## Format a USB drive with an ESXi installer
I *heavily* borrowed this approach and associated commands [from this Github project](https://github.com/cbednarski/vmware-usb-osx/).  To prep:

* Download the ESXi ISO file to a folder on your machine and name it *esxi.iso*
* Download the syslinux.cfg file from the Github project link into the same folder
* In Terminal, `cd` to the destination directory where these two files live and do this:

### Terminal commands

```
diskutil list
```

*(This command is to identify your USB drive...in most cases it's /dev/disk2 but be careful!!!  My commands below assume /dev/disk2!!11!111!!!!)*

```
sudo diskutil eraseDisk MS-DOS ESXI MBR /dev/disk2
mkdir -p source
mkdir -p target
hdiutil mount esxi.iso -mountpoint ./source
cp -r source/ /Volumes/ESXI/
cp syslinux.cfg /Volumes/ESXI/
hdiutil eject ./source
diskutil unmountDisk /dev/disk2
diskutil eject /dev/disk2
```

## Secure erase the primary Mac OS drive
First create a USB install of Mac OS, boot to it, and drop to Terminal.  Then find your physical disk path:

```
diskutil list
```

Unmount it (in my case `disk0`):
```
diskutil unmountDisk disk0
```

Then secure erase it:

```
diskutil secureErase 2 disk0
```

*(Run `diskutil secureErase`) to see all the options.  I did option 2 which is a seven-pass "secure" erase)*