I have a Seagate Exos X12 ST12000NM0127 12TB SATA drive. It has a documented "Formatted capacity" of 12000GB (12TB), "Guaranteed sectors" 23437770752 for 512 bytes logical sector, that is 12000138625024 bytes (0xAEA00000000). This precisely matches the SFF-8447 proposed standard, which starting at 4000GB boils down to advertised capacity rounded up to a multiple of 1GiB when it comes to drives with 512 or 4096-byte LBA and no frills. However the drive has 2,344,912 more sectors (0.01% larger ...
