USB Hard Disk was disappear

Hi @artidtawon,

Have you checked our knowledge base articles?
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Try this one.

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If not, contact Sandisk Technical Support for assistance.
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If your USB drive appears grayed out in File Explorer, it could be due to a connection issue, file system corruption, or a drive letter problem. Try another USB port or computer first, then check Disk Management to see if the drive is detected. If it contains important files, avoid formatting it and try data recovery software to recover your data.
You can find out a more detailed guide here: How to Fix USB Not Showing Up? Find All 8 Ways Here

Try connecting the hard drive to a different USB port or using another cable. If possible, connect it to another computer to see if it’s detected there.

You can also check Disk Management in Windows to see if the drive appears. If your data is important, don’t format the drive just yet.

Could you share what you see in Disk Management and whether the drive is making any unusual noises? That will help us figure out what might be wrong.