For hardware description language file, see VHDL. VHD (Virtual Hard Disk) is a file format which represents a virtual hard disk drive (HDD). It may contain what is found on a physical HDD, such as disk partitions and a file system, which in turn can contain files and folders. It is typically used as the hard disk of a virtual machine.
Typically, koi eggs will hatch in less than a week. Koi eggs are very small, bead-like specks that can vary from milky white to yellow or green. Upon closer inspection, you can see two black dots through the transparent membrane of the egg. These are the developing eyes of the koi.
When koi eggs are fertilized, they cling to pond plants for three to four days. Once they hatch, they sink to the bottom of the pond. These baby koi are called koi fry. Once released from their yolk sacks, the baby koi take cover in pond plants. Baby koi do not typically need to be fed in the first few days.