SanDisk Extreme USB 3.0 64GB Flash Drive with Windows 8 (not 8.1) Pro 64-bit.
Inserted new UFD in USB 3.0 port, and Windows recognized it and assigned drive letter.
Decided to repartition the UFD with 2 partitions, and reformat with NTFS. Used Windows Disk Management to delete the UFD’s single factory partition that had FAT32 format.
However, after the partition was deleted, then decided not to repartition or reformat.
Since Disk Management can’t undelete a deleted partition, needed to use 3rd party software that could. Had old program that could undelete partitions, but doesn’t support USB 3.0.
Removed the UFD from USB 3.0 port on computer #1 running Windows 8, and inserted it into USB 2.0 port on computer #2 that ran the software that could undelete the partition.
The partition was successfully undeleted.
Reinserted the UFD into USB 3.0 port on computer #1, and the UFD’s blue LED turned on.
However, Windows Disk Management, Diskpart, and File Explorer all failed to recognize the UFD in the USB 3.0 port.
Removed the UFD from USB 3.0 port on computer #1, and inserted it in a USB 2.0 port also on computer #1.
Windows Disk Management, Diskpart, and File Explorer all recognized the UFD in the USB 2.0 port, although they didn’t when it was in a USB 3.0 port after the partition deletion and undeletion.
The UFD’s disk and partition information shown by Disk Management while in the USB 2.0 port after the partition deletion and undeletion was the same as that shown when the UFD was in the USB 3.0 port before the partition deletion. For example, partition capacity 58.42 GB and file system FAT32 were shown both before and after the partition deletion and undeletion.
To summarize, after the UFD’s factory partition was deleted while in a USB 3.0 port and then undeleted in a USB 2.0 port by software that doesn’t support USB 3.0, Windows 8 can only recognize it when the UFD is in a USB 2.0 port, and can no longer see it when it’s in a USB 3.0 port.
How can this be fixed so Windows 8 can again see the UFD in a USB 3.0 port?