Home > Storage > PowerVault > Guides > Dell PowerVault ME5 Series: VMware Horizon VDI Best Practices > Capacity
The density of data on VDI tends to be high because many Horizon VDI environments use data-reduced clones.
The advantages of small virtual desktops include faster boot times, reduced capacity requirements, reduced pool creation time, and fewer updates required. With instant clones, the administrative overhead is reduced even further with the automatic refresh of virtual desktops on logout. Any misconfiguration in a VM is cleared when the user logs out and the machine is refreshed.
Drive counts for block-only VDI are more a function of IOP requirements than capacity. Since the VMs generate many IOPS for each TB of storage that is consumed, performance is more of a concern than capacity. With VDI, SSDs are recommended to optimize performance.