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I opened up my Seagate Expansion Drive (3TB) to get to the hard drive itself. I wanted to use it in my PC and access it through SATA. But I cant mount the drive on linux. If I try to access it through windows with another SATA/USB-Adapter, Windows says, that the drive has to be formatted before using. Accessing through the SATA/USB-Adapter from the Seagate Drive works fine.

How can this behaviour explained and how can I get the drive working in my PC?

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It's most likely an emulation problem for backwards compatibility.

4k emulation sata usb controllers

Why is my USB drive showing corrupted data when plugged as an internal SATA drive?

I have a 3TB Seagate Backup Plus Desktop USB 3.0 drive, which works fine when in its enclosure, but when I get it off its enclosure and directly plug it as an internal SATA drive, it's just not properly recognized (it works again when used in the enclosure). My systems’s motherboard is an ASUS P8P67 LE, which has two SATA 6.0 Gb/s and four SATA 3.0 Gb/s ports.

When used as an internal SATA drive Windows 7 asks if I want to format the drive, as if it didn’t have a proper filesystem, and if I use the DISKMGMT.MSC tool (typing that in the start menu) I get completely wrong information about the drive.

It says the drive has 3 partitions (349,31GB of RAW data and two unassigned partitions of 1698,68GB and 746,52GB). This information is plain wrong, since the drive, when used in the USB enclosure, works as a single NTFS partition (2794,52GB). How come it’s shown as 3 partitions without filesystem when connected through SATA?!

Is Seagate using some proprietary way of storing the data when using the drive in its provided USB 3.0 enclosure? I didn’t use any kind of encryption. I just plugged the drive with USB 3.0 and started using it straight away, since it apparently came pre-formatted with an NTFS filesystem.

See the accepted answer.

If you were to remove it from the case you would most likely find an adapter connected to it. Something like this. I did find one on an older 2 TB model. https://duckduckgo.com/?q=JMS578&t=ffsb&atb=v1-1&iax=images&ia=images

  • The proper procedure is to flag as a duplicate instead of submitting a new answer which quotes the entirety of a duplicate’s answer. – Ramhound Feb 27 at 1:23
  • I've also added a clarification by mentioning the adapter. And the fact that Seagate won't likely be helpful. Their website mentions that if the situation described happens "you might want to look into data recovery". Which is grossly misleading. – user208073 Feb 27 at 1:31

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