AMCC 3WARE 720-0138-00, Installation Manual

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Determining What RAID Level to Use
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Through drive coercion, the capacity used for each drive is rounded
down so that drives from differing manufacturers are more likely to
be able to be used as spares for each other. The capacity used for
each drive is rounded down to the nearest GB for drives under 45
GB (45,000,000,000), and rounded down to the nearest 5 GBytes
for drives over 45 GB. For example, a 44.3 GB drive will be
rounded down to 44 GBytes, and a 123 GB drives will be rounded
down to 120 GBytes.