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Seagate Barracuda 18XL PayPal Donations

Seagate Barracuda 18XL ST318436LW
  March 29, 2000 Author: Eugene Ra  

WB99/Win2k Low-Level Measurements

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Click here to examine the STR graph for this drive

Some interesting things are revealed here. Thanks to smaller platters, Seagate's rated access time (ignoring overhead) for the Barracuda 18XL equals its specified 5.8 millisecond seek time plus a 4.2 millisecond latency that exists for all 7200rpm drives... an access time of approximately 10 milliseconds. The Quantum Atlas V, with its 7200rpm spindle speed and a 6.3 millisecond seek time, features a specified access time of 10.5 milliseconds, a full half millisecond difference in Seagate's favor.

Interestingly, however, the Atlas V soundly defeats the Barracuda 18XL when it comes to access time, by 1.6 milliseconds. When considering overhead, the Atlas V actually beats its own specified seek time by perhaps half a millisecond, while the Barracuda turns in a figure that we'd expect from a drive pushing 7 milliseconds in the seek domain.

The smaller platters found in the 'Cuda hint that the sequential transfer rate in the outermost tracks will be a bit lower than a drive that features full-sized platters such as the Atlas. This does indeed turn out to be the case. While the Atlas V manages to pull 29 megs a second off of its disks in its outermost zone, the Seagate drive manages a bit less than 27 MB/sec. As we've outlined in previous articles, however, sequential transfer rates' influence is important in a minority of applications.



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