Originally Posted by djriful
3TB Seagate (ST3000DM001) one read and write speed are up to 175mb/sec. This is way faster than my WD Caviar Black which it can only top 125mb/sec.
Don't listen to those 6Gbps marketing. All the spinning HDD can't even saturate 3Gbps yet. 3Gbps is 250mb/ sec...
I would buy another ST3000DM001 in a heartbeat if I need more room later.
True. Those new Seagates are nice performers.
But the Blacks still have superior seek times and NCQ, so for multitasking they are still the kings. We need to know what he intends to use it for before recommending a drive. As an OS/Apps/Games drive the WD Black will likely still be faster - but if he has an SSD for OS/Apps and the HDD is going to be dedicated to games/storage, he will probably be better off going for the Seagate.
The new 1TB-platter Seagates dominate when it comes to sequential speeds, which are great for file copies and single-tasking situations. That's why the new Seagates are great when dedicated to games.
But when you ask them to multitask (or *gasp* run an OS) it's another story entirely. They pretty much fall flat on their faces due to their slightly higher seek times and simplistic NCQ, resulting in much lower performance. Here you can see a WD Green 3TB stomping all over it, just because it's making better decisions reordering reads/writes:
Most of the drives at the tops of these graphs have sequential speeds maxing at around 120-140MB/sec rather than the ~200MB/sec of the ST3000DM001. It seems like it shouldn't be the case, but don't underestimate the importance of NCQ or seeking intelligently for a shared OS/Apps/Games drive.
Dedicated to a single task at a time, the new Seagates perform much better.
So, are you planning to get an SSD any time soon? Decide on that, and then you can decide on which drive to go for.
Oh - If I remember correctly the WD Black 2TB is on par with (or slightly above) the Barracuda XT 3TB in performance.