Why does my WD drive read as unformatted outside its case?

Because most modern My Passport and My Book units encrypt in hardware, with the key material held on the USB bridge board rather than on the disk. Removed from the enclosure, the platters hold ciphertext and nothing capable of reading it.

I threw the enclosure away. Is the data lost?

Not necessarily, but it is materially harder. The route depends on sourcing a compatible bridge from the same family and revision, which is not guaranteed. If you still have the case anywhere, retrieve it.

Windows offered to initialise the bare drive. Should I have accepted?

No, and declining is what saved this job. Accepting writes a fresh partition structure over the encrypted volume, damaging a perfectly healthy disk and adding a second avoidable problem to the first.

Does this apply if I never set a password?

Yes. These units encrypt by default — setting a password adds authentication on top rather than switching encryption on. A great many owners have no idea their drive is encrypted at all.

Is the drive or the enclosure more likely to have failed?

The bridge board fails at least as often as the disk. Which means a dead external is frequently a healthy drive behind a failed interface — good news, and only good news if you still have the interface.

What should I send you?

The complete unit: drive, enclosure, board, and the cable and power supply if there is one. Even if the case looks broken or irrelevant, send it — on WD units it is the part that decrypts everything.

// scenario · External drives

The disk was perfect. The case had been thrown away.

A My Passport that stopped being detected, opened up on the entirely reasonable assumption that a bare drive reads on any machine. It did not — and by then the part that could have decrypted it had gone out with the packaging.

← All case files · £300 + VAT, flat

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This is a scenario, not a case study. It describes a failure pattern we handle regularly and how it is approached, written from the technical work rather than from one client's job. Our documented case files are here.

An external drive stops being detected. The advice found online is to open the case, remove the bare disk and connect it directly to a SATA port. On some enclosures that works. On several of the most common ones it produces a disk that reports as unformatted — and Windows then offers to initialise it.

// where the key lives

On the board, not the platters.

Several manufacturers implement hardware encryption in the USB bridge rather than in the drive. Everything written passes through the bridge and is encrypted on the way to the platters; everything read is decrypted on the way back. The process is invisible and requires no configuration, which is why most owners have no idea it is happening.

The key is held on that bridge board. Not on the disk, not derived from a password, and not recorded anywhere else. Separate the two and the disk holds nothing but ciphertext with no means of reading it.

WD My Passport and My Book are the ranges where this catches people most often. WD Elements generally does not encrypt, which is why identical-looking advice works for one and destroys access for another.

// what to do instead

Send the whole unit.

SituationActionWhy

Drive still in its caseSend it complete, with cable and PSU The disk can be paired with its own bridge, or the key extracted from the board where the bridge itself has failed. Best case

Drive already removedSend the case as well — do not discard it Even a dead-looking board holds the key. This is the difference between a routine recovery and an impossible one. Still fine

Case thrown awaySend the drive and say so Considerably harder. Some implementations allow the key to be derived; others do not. Honest answer at diagnostic. Difficult

Windows offered to initialise and you acceptedStop using it, send everything Initialising wrote a new partition structure over the encrypted volume header. Recoverable in some cases, not all. Urgent

// how to tell in advance

Before anything fails.

If the drive came with software that offered password protection, it almost certainly has an encrypting bridge whether or not you set a password — on many models the hardware encrypts regardless, with the password only controlling access to the key.

The practical rule is simpler: do not shuck an external drive you might one day need to recover. There is no advantage to it in a failure scenario, and on the ranges where it matters it is irreversible.

If the enclosure has already failed and the drive inside is healthy, that is exactly the case a laboratory handles routinely — provided the board came too.