When you cannot see one of your flash drive partitions in Windows Disk Management, which means the partition might be lost, and of course, the data store on them cannot be accessible, too.
However, if the flash drive partition is lost, you do not need to be despaired. When your hard drive partition is lost, you didn't initially lose everything but just the parameters that mark how the partition is setup. However, to restore the deleted or lost hard drive partition, you just need to reestablish those parameters. In this situation, partition recovery software is the best choice.
Now the removable storage device like flash drive is more and more popular. If the flash drive partition was deleted or lost accidently, is there any chance to recover deleted or lost flash drive partition as the same as the hard drive?
The answer is yes. In fact, EaseUS Partition Master can support the removable storage device like USB flash drive, memory card, memory stick, SD card, etc. You can use it to resize USB flash drive partition, partition USB flash drive, delete and wipe USB flash drive partition, convert FAT file system to NTFS on USB flash drive, recover deleted or lost USB flash drive partition, format USB flash drive partition, etc. under Windows 2000/XP/2003/Vista/2008/Windows 7/8.
When the partition is deleted or lost, there are two ways to recover it:
Compared to data recovery, partition recovery is a better choice and just takes a few seconds to find the deleted or lost partition back.
1. Launch EaseUS Partition Master, click "Wizard">"Partition recovery wizard", and then you will see the wizard window.

2. Click "Next" to continue, there are two recovery modes: Automatic and Manual.
3. Select a recovery mode and follow the wizard to recover deleted or lost flash drive partition.
For detailed steps, refer to How to recover deleted or lost partition?
Besides USB flash drive partition recovery, EaseUS Partition Master can also recover deleted or lost hard disk drive partition. It is a complete partition solution to your USB flash drive and hard disk partition problem.
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