This old data is not erased or written over, so it needs to be "zeroed out" before new data can be written to the blocks. A Lazy zeroed disk is a disk that takes all of its space at the time of its creation, but this space may contain some old data on the physical media.There are two sub-types of thick-provisioned virtual disks: A thick-provisioned virtual disk consumes all the space allocated to it in the datastore right from the start, so the space is unavailable for use by other virtual machines. With thick provisioning, the complete amount of virtual disk storage capacity is pre-allocated on the physical storage when the virtual disk is created. Thick provisioning is a type of storage pre-allocation.
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