Why is it better to use a dynamically expanding virtual hard disk rather than a fixed-size virtual hard disk?

A dynamically expanding virtual hard disk is more efficient in storage usage, as it only consumes space on the host when data is actually written, rather than reserving the entire allocated size upfront as a fixed-size disk does. This allows for more flexibility and efficient use of disk space, making it easier to manage resources, especially in environments with multiple virtual machines. Additionally, it enables quicker initial setup and deployment since less space is needed at the outset. However, it may lead to slightly slower performance during heavy data usage compared to fixed-size disks.