My Book Studio for Mac - Showing 3TB with a 4TB HDD after Upgrade

Hello WD Community,

In 2013, I purchased a My Book Studio for Mac external hard drive with a 3TB capacity. The unit served me well until recently, when it began making a loud noise and eventually failed. Initially, I thought the noise was from the cooler, but it turned out to be the disk itself, since it has no cooler whatsoever inside it.

I really like the enclosure—it’s a beautiful silver metal—so I decided to replace only the internal hard drive rather than the entire unit. Upon disassembly, I found that the original drive was a 3TB green model, which is no longer available. Instead, I purchased a brand new 4TB blue drive, the proper sucessor in my understanding.

I successfully installed the new drive inside the enclosure, but my Mac still reads the device as a 3TB unit. While WD Drive Utilities app recognizes the full 4TB, Finder only displays it as 3TB.

Could this be a limitation of the enclosure’s circuit board? I chose the 4TB model because it is compatible with the My Book Studio, as confirmed on Amazon: link.

If anyone has insights on how to resolve this and access the full capacity, finding this missing TERABYTE, I would greatly appreciate your help!

Thank you so much!

Hi @RafaChaves

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:

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