Format:'FlashDisk'

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Your Sandisk has failed perhaps?

 

^^
Hi, have you ever tried computer management \ disk management and use your tools? if yes then it may be poor device quality this has happened to me sometimes

 

yep is true myself have one SSD Sandisk and never had issues, but when related to Pendrive's here in Brazil is very complicated because any people can bought "false" Pendrive sandisk until bus, subway or same in streets so caution with this devices @ low cost

 

In the future, you could try this from an elevated Command Prompt:

diskpart < Invoke diskpart command subset
list disk < Lists all system disks. System drive is assigned 0 and flash drive will be 1 (or higher if you have other storage devices connected)
select disk 1 < In this example I'm using 1. It's up to you to figure out the correct number assigned to the flash drive in the above step
attributes disk < This will confirm if it's current status is read-only
attributes disk clear readonly < Changes read-only status to read-write
clean < Remove all existing partitions on the disk
exit < Exit diskpart

 

You can also use the command clean all which specifies that each and every sector on the disk is zeroed, which completely deletes all data contained on the disk.

However users should be extremely careful using these commands as choosing the wrong disk can cause unnecessary headache.

 

@Digital_Jagh : attributes disk clear readonly

 

@Digital_Jagh : Have you closely examined the flash drive itself? Any chance that there's a small switch or tab on the outside that's used to write protect the device?

 

Hmm I'm sure it's a bad pendrive to avoid hassles play it in the trash