Seagate Iron Wolf Pro is a class of hard disk drives used exclusively in NAS (network attached storage) devices.
Without getting too
technical normal hard (spinning) disks attach via a SATA 6 interface (6Gbps or 750MBps)
to a motherboard. Take in to account processing overheads, two-way traffic on
the ‘bus’ and the very best SATA 6 drives will achieve around 500MBps
sequential read/write speeds. Let’s just
say that the average hard disk does not need a very sophisticated controller or
a huge cache as the CPU/Memory does most of the work.
So, what happens when you attach a normal hard disk to a NAS which has a 1Gbps (125MBps) LAN ethernet interface. Note that some NAS have dual Ethernet (2Gbps) and some have 10Gbps interfaces. Obviously, the NAS has a bottleneck! The answer is lousy performance and shorter life (and data is gold).
NAS drives must be smarter to deliver good performance.
These drives have larger cache memory that allows data to be ‘dumped’ into and out of the drive and make maximum use of the LAN speed.
Second, they have more intelligence to do things like
elevator seek – it means the drive magnetic heads read sequential data from the stacked drive platters at the same time.
The also have command queuing to enable them to complete a task more
effectively – getting from A-Z without detours. These drives can sustain 250MBps
read/write if your LAN supports it.
That intelligence also allows the drive to reorganise its
data when not in use to make it easier to get sequentially.