External drives · Mounting and drive problems
Why does my Mac ask to "Allow accessory to connect" when I plug in a drive?
Short answer: On Apple silicon Mac laptops, macOS asks before a new USB or Thunderbolt accessory connects. Click Allow for your drive. If you chose Don't Allow, change it in System Settings → Privacy & Security → Allow accessories to connect, then replug the drive.
On Mac laptops with Apple silicon, macOS asks before a new USB or Thunderbolt accessory can connect. It's a security feature that stops an unknown device from talking to your Mac without your say. Click Allow for a drive you trust.
If you clicked Don't Allow, the drive won't mount. To change it, open System Settings → Privacy & Security and find Allow accessories to connect. You can choose to ask for new accessories, allow them automatically when the Mac is unlocked, or always allow. Then unplug the drive and plug it in again.
Storage Studio can't use a drive macOS hasn't allowed to connect, so approve your fast drive the first time you plug it in.