GibiBytes or GigaBytes?

Does PCSpecialist quote drive/partition capacities in units of

1 gibibyte (GiB) = 2^30 bytes = 1073741824bytes?

(as MS windows does); or units of

1 gigabyte (GB) = 10^9 bytes = 1000000000bytes?

I *think* it's the former, but I'm not sure they do so consistently.
 
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