Reasons: “Extend Volume” will be grayed out under the following 2 situations:
1.Existing drive was formatted with FAT32.
2.Unallocated space is located before the drive users want to extend.
Solution: when users cannot extend USB drive to unallocated space, downloading a free partitioning tool from the internet is a wise choice. This kind of software is capable of enlarging a drive no matter what the partition type is or where the unallocated space is located. If users do not know which partition software to choose, try using MiniTool Partition Wizard. It is believed that users would never regret using it.
How to Extend USB Drive to Unallocated Space with MiniTool Partition Wizard
Step 1: run this free partitioning tool to get the main interface where all drive information is shown:
Step 2: select the drive which needs extending namely drive H and choose “Extend Partition” feature from the left pane to get the following interface:
Step 3: choose an existing partition or unallocated space on the same disk to take free space to extend the target drive, and then drag the sliding button to decide how much space to take. After that, click “OK” to go back to the main interface:
Now, we can see the unallocated space has been extended to USB flash drive, but this is only a preview effect. Therefore, please click “Apply” button on the top to execute changes. After application, all work will be done.
When users cannot extend USB drive to unallocated space, resort to MiniTool Partition Wizard. This free partitioning tool would solve your problem in almost all situations.