Example implementations relate to objects in extents on a storage resource. In an example, an extent identifier is persisted to a storage allocation table, where the extent identifier locates an extent on a storage resource. An extent map tracks which objects in the extent are deallocated. A virtual block address is generated allocating an object to store data. The virtual block address may include a storage allocation table key that locates the extent identifier in the storage allocation table and an extent offset to locate the object within the extent.