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New Barracuda 7200.11 and ES.2 offer capacities up to 1TB with 32MB caches

Seagate today unveiled two 1TB hard drives for consumer and enterprise markets – the new Barracuda 7200.11 and Barracuda ES.2. Seagate claims to have “the world’s most advanced family of one terabyte drives” with the new Barracuda models.

The new Barracuda 7200.11 is the follow up to last year’s Barracuda 7200.10, ready to take on Hitachi and Samsung 1TB offerings. Seagate packs the 1TB Barracuda 7200.11 with 32MB of L2 cache, SATA 3.0Gbps and native command queuing support. The Barracuda 7200.11 makes use of four 250GB platters with second-generation perpendicular magnetic recording technology, or PMR. Seagate claims the new Barracuda 7200.11 can sustain 105MB/s data rate.

Even with four platters, Seagate claims the new Barracuda 7200.11 only draws 8-watts during idle and 11.6-watts during seek. Acoustically, the Barracuda 7200.11 generates around 27-to-29 decibels of noise during idle and seeking tasks. As with all new Barracuda generations, the 7200.11 improvements and technologies trickle down to smaller sizes. Seagate also offers the Barracuda 7200.11 in 750GB and 500GB sizes with the same 32MB buffer and PMR technology. Due to smaller sizes, the 750GB drive makes use of three platters while the 500GB drive has two platters.

Seagate’s new Barracuda ES.2 models cater towards the enterprise markets. Although it is similar to the Barracuda 7200.11, Seagate offers the ES.2 with serial attached SCSI, or SAS, interfaces. Seagate has also raised the MTBF rating of the Barracuda ES.2 to 1.2 million hours, up 200 thousand hours from the previous Barracuda ES.

Expect the Barracuda 7200.11 and ES.2 to arrive sometime this quarter in capacities up to 1TB. Seagate prices the 1TB Barracuda 7200.11 with an MSRP of $399. As with other Seagate drives, the new Barracuda 7200.11 and ES.2 come with five year warranties.

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By DeepBlue1975 on 6/25/2007 8:12:42 PM , Rating: 2
What you say is true, plus the fact that today's 15k rpm SCSI drives use much lower areal density, just like what happens with the "pseudo desktop" raptor.
You can't spin that fast and, at the same time, use the highest possible areal density without challenging the physics implied in getting a data read from the physical disc by the drive's head, and at the same time lower the area that head must be able to read.
Maybe the magnetic effect used to read stuff from the plate doesn't allow less than a certain time of "hovering" over the "physical chunk of data" and then you can't just diminish the area occupied by the data because the high rotational speed of the head wouldn't allow for enough "exposure to the physical data".

By patentman on 6/26/2007 7:48:31 AM , Rating: 2
No, areal density is bits or bytes per square inch. High speed drives generally use smaller platters with the same area density.

By patentman on 6/26/2007 7:57:52 AM , Rating: 2
Most HD's use a magnetoresistive element as a read head. That is, the head has a rotatable magnetic domain that reacts when it is exposed to external magnetic fields, e.g., the magnetic grains in the recording layer of a HD platter. As the domain in the head moves, the resistance of the head changes. This reistance change is monitored by the drive electronics and corresponds to the data on the disk.

To improve the read speed of a MR head, the magnetic domain must be allowed to re-orient itself more easily in response to the presence or absence of an external magnetic field. In other words , the coercivity of the head must be decreased. Reduction in head coercivity is also necessary to allow the head to read high areal density media, as the information stored on such media is present in smaller magnetic grains that output a less intense magnetic field

The issue with reducing coercivity is that that the orientation of magnetic domains is also affected by temperature. If the coercivity of the MR head is lowered beyond a certain point, it becomes very difficult to maintains the orientation of the domains in the head (they spin randomly) at room temperature.

One thing most people do not realize is that in most cases, the major components of a hard drive must be developed in conjunction with one another, else they will not work. Hopefully my posts clarified some of this.

By TomZ on 6/26/2007 8:53:31 AM , Rating: 2
Great posts, thanks patentman!

By DeepBlue1975 on 6/26/2007 9:04:58 AM , Rating: 2
Great info, Patentman!
Thanks for the clarification, I had some misconceptions about this :D

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