Single USB drive as a network share

Is it possible to add a single Standalone USB drive to a trueNas server, just a function as a file share that I want available widely on the network? When I try to add it as a new pool it demands that there be a second drive to set up an array. That’s not what I want in this case

if you choose stripe as pool layout you should be able to create a single disks pool (you may have to tick the force creation checkbox) and then create a simple smb share from it.

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Will I lose the data that I already have on that disk?

If it’s not already using zfs then yes. zfs is the only filesystem supported by truenas. Truenas will wipe the disk and format it using zfs.
Many routers also have the option to attach a disk and present it as storage over the network. If you don’t want to format the disk this may be a better approach for you.

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