The tier of an Azure virtual machine dictates the number of disks that can be attached to it -- e.g. A1, A2, and A3 VMs support two, four, and eight disks respectively. SnapCLOUD OS itself has no restrictions on the number of attached disks. SnapCLOUD also has no knowledge of the tier/size it runs underneath or the total number of disks that can be attached. As a result, SnapCLOUD's web UI represents total virtual disk slots in increments of four, growing the available slots when the number of attached disks extends past a multiple of four (e.g. if there are two attached disks SnapCLOUD displays two disk slots populated out of four, and when there are five attached disks SnapCLOUD displays five disk slots populated out of eight).