How to reformat a HDD to show the proper size

Long story short. On my iMac I had a Fusion Drive: 250GB SSD + 750GB HDD.

The SSD failed totally, is completely dead. HDD seems to be OK. I replaced the SSD and erased the HDD.

The HDD seems to be OK. I can use it normally and Disk Utility doesn't show any problems. Only it shows the wrong (old) size - still 1TB:

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Data 999.9 GB disk0s2

I am afraid to use this drive as it shows more space then there is physically.

Is there a way somehow to reset this drive totally so I can use it again? Standard utilities like diskutil and fsck_hfs exit without any errors.

Thanks,

Pawel

最後更新：2017-09-08 15:42:00