That was a post well worth waiting for.
The datasheet lists only the maximum media transfer rate which is 518Mbps.
I believe that was revised to a lower figure. You can see the full technical library for the Travelstar 7K60 here. The real in-depth documentation for that drive is the "Specification v2.0" manual, which quotes 507Mbps. That figure is also corroberated in the "Product Summary 1.1".
The "Specification v2.0" manual and the "Product Summary 1.1" list the 507Mbps as the "media transfer data rate".
Unfortunately raw transfer rates...[referring back to the 507Mbps rate quoted above]
I guess that whenever a manufacturer refers to a "media transfer data rate" that means a raw rate.
...to determine the true transfer rate of that drive...33.12 MBps.
Thanks for that. I didn't know it was so easy to figure out the user data transfer rate. I guess you can count on there being 512 bytes of user data in every sector on every hard drive, so if you know the rpm, and the sectors per zone, it's not that hard to figure out.
Thanks for taking me through that. If I ever want to know the transfer rate of a drive, I know I can just do the same thing.
...the outer zone...the inner zone...The average data transfer rate of the drive is the average of those two figures
That's good to know. I didn't know that was how they calculated that.
Just for fun, I ran HD_Tune on the drive:
Minimum Read Rate: 1.3 MBps
Maximum Read Rate: 36.9 MBps
Average Read Rate: 24.4 MBps
Access Time : 15.9 ms
To reiterate, the Ubuntu benchmark got me:
Minimum Read Rate: 18.8 MBps
Maximum Read Rate: 38.8 MBps
Average Read Rate: 30.3 MBps
Average Seek Time: 14.9 ms
You mostly use Windows software for benchmarking and diagnostics and so forth. Ubuntu is my preferred OS, so I like to get a comparison of Windows vs. Ubuntu software when there is a comparable Ubuntu software for a job. At least for this particular drive the Ubuntu benchmark was closest (to the true average rate, 33.12MBps), so maybe I shouldn't rule out this particular software for benchmarking drives.
Perhaps one can't count on a lot of accuracy with hard drive benchmarking programs and the Ubuntu software came closer by chance. At any rate I intend to keep HD_Tune as part of my toolkit. I see it has a lot more features, some of which I haven't figured out yet.
Normally when dealing with raw transfer rates in Mbps you can divide the rate by 11 or 12 to get an approximate data only transfer rate in MBps.
Doing a little algebraic gymnastics:
(Mb/s)(raw rate) * (1/11 or 1/12) = (MB/s)(formatted rate)
[(MB/s)(8bits/1Byte)](raw rate) * (1/11 or 1/12) = (MB/s)(formatted rate)
(MB/s)(raw rate) * (8/11 or 8/12) = (MB/s)(formmatted rate)
8/11 or 8/12 = (formatted rate)/(raw rate)
(formatted rate)/(raw rate) = 8/11 or 8/12 = ~3/4 or 2/3
In URPCs, 20th edition page 485, you write, "...the formatted rates are about three-fourths the raw rates." You've given me an approximate range of between 3/4ths and 2/3rds now. That's even more precise, that may be helpful when calculating these things in the future.
Looking back on it I guess the 11 and 12 figures are more useful since rates are probably more typically listed in Mbps.
When addressing my question:
How can I know for sure if the hard drive I'm looking at will fit in my particular system?
You didn't say anything about the arrangement of the pins on the drive.
I've noticed that different PATA laptop drives can have different pin arrangements.
Normally, if I was shopping for a hard drive for my laptop without your help, I'd go to eBay and search "ThinkPad T40p hard drive". That way I would know for sure that the pins would fit the laptop.
I examined your link to a group of supposedly compatible hard drives on NewEgg. I noticed the trace of links at the top of the page:
Computer Hardware >
Hard Drives >
Laptop Hard Drives >
Interface : IDE Ultra ATA100 / ATA-6
Is there some kind of standard form factor for ATA-6 drives with a given pin arrangement? I didn't see anything in the documentation for the Travelstar 7K60 that really said much about the pin arrangement or form factor. Did you figure out that this is such an "ATA-6 form factor" drive because there wasn't any documentation to the contrary?