Hi there Arizky Triputro,
How is the drive recognized by BIOS? In case it is recognized as 0, then it is possible that the HDD has failed. If this is the case, and the HDD is still under warranty, it may be a good idea to contact the manufacturer and eventually RMA the drive.
Apart from that, you can try some basic troubleshooting steps like attaching the drive with a different cable to another USB port. You can even try the drive on another system.
Some users attempt taking the drive out of the enclosure in similar cases. Though, keep in mind that this will void the warranty and you can't be sure whether it will work out or not. In case the HDD inside the enclosure has failed, this wont help. Also, this approach will not work in case the drive has some kind of proprietary connector or hardware encryption.
Cheers,
D_Know_WD