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Virtual Machines

Convert vhd to vmdk

Convert a virtual hard drive from vhd (common with VirtualBox) to vmdk (common with VMWare):
VBoxManage clonehd --format vmdk Windows.vhd Windows.vmdk

Accelerate your VirtualBox

MariaDB performance tests

Comparison of storage engines

MyISAM with VARCHAR colums Aria with VARCHAR columns Aria with CHAR columns

Bluetooth Mouse

If your Bluetooth Mouse keeps disconnecting, try the following:
https://serenity-networks.com/bluetooth-mouse-disconnects-on-ubuntu-16-04-with-intel-7260/
Add the corresponding device to the blacklist in /etc/default/tlp, right after the line USB_BLACKLIST_WWAN=1:
USB_BLACKLIST="8087:07dc"
This is obtained by lsusb.