This problem also happened after OS X Yosemite update. External hard drive showing up in Disk utility not in Devices.Note: The following steps create an HFS+ (Mac OS Extended (Journaled)) partition that uses the entire drive space.
If you are not prompted to initialize the drive and you cannot find the drive in Finder, you will need to create a partition on the drive. Scan the hard drive which shows abnormal behaviour like hard drive empty but shows full. Method 2: – Scan Hard Disk to Fix Hard Drive Appears Empty But Isn’t.
