I recently bought a 4 TB Seagate Desktop Expansion external hard drive. However, after formatting it with Disk Utility the device still says 4 TB but the capacity says 1.8 TB. What is going on?

  • Can you run the command diskutil list? – JMY1000 Jun 7 '16 at 18:30

Did you completely wiped it via the Apple Disk utilities and formatted it Mac Journaled? It might look like you kept a partition of the disk (FAT32 or NTFS)

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