VirtualBox Cannot register the hard disk already exists

virtualbox

I created a virtual disk file VM_1_Ubuntu.vdi. Then I moved it into another folder. I tried to update VM settings (right click on virtual machine -> settings -> Storage -> Controller SATA tab, VM_1_Ubuntu.vdi path). I wanted to set a new path.

It says
Cannot register the hard disk already exists

Best Answer

I found a solution

File -> Virtual Media Manager -> Removed existing images (note, I removed them only from the registry).

I followed these steps.

http://www.webdesignblog.asia/software/virtualbox-moving-vdi-file-re-linking-guest/#sthash.1QOHeiw5.dpbs

After that I could update the path in the VM settings.

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How to change the UUID of a virtual disk

The correct command is the following one.

VBoxManage internalcommands sethduuid "/home/user/VirtualBox VMs/drupal/drupal.vhd"

The path for the virtual disk contains a space, so it must be enclosed in double quotes to avoid it is parsed as two parameters.

Mysql – Updating one thesql table based on calculations using variables in another table

Well, for one you're not specifying 'source' as a table anywhere.

MySQL actually supports multiple table update, so you could write your code as:

UPDATE target, source
   SET target.col1=source.col1*target.col2
 WHERE target.col3=source.col3

Now whether that would actually do what you want I can't tell without knowing more about your tables.

Best Answer

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Mysql – Updating one thesql table based on calculations using variables in another table

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