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johmut

10 Posts

5219

January 28th, 2008 14:00

Burst Performance & Sustained Data Throughput

Hi All,
 
On my Latitude D620 equipped with Hitachi's 7K100 series SATA 100GB drive,
I am seeing speeds that max out at 48,3MB/s averaging 35MB/s ????
 
Isn't a 7200rpm SATA drive capable of more sustained data throughput than that ?
Where is the bottleneck is my system that blocks it from peaking around 150MB/s as I would expect from SATA hardware (Intel SATA controller + SATA hard drive) ???
 
Is it because the D620 is not capable of doing through SATA ? The Primary IDE channel on the controller is reported to use UDMA Mode 5, that is ATA-100 I believe, clipping at 100MBps.
Then still, why is the drive only delivering 48MB/s peaks ?
 
If I get an external FireWire800 interfaced drive would it be faster ? FW800 is rated for 100MB/s.
Does 7200rpm or 5400rpm matter for an external disk ?
 
TIA
Best Regards,
Johan

ejn63

9 Legend

 • 

87.5K Posts

January 28th, 2008 15:00

There are many variables that influence throughput, but although a SATA 150 drive can theoretically sustain 150 MBps, the drive platters cannot deliver anywhere near that much - 60-65 burst and sustained well below that for any 7200 drive is quite normal.

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