Imac seagate 750gig Hard Drive performance

Ive got a new alum imac that I got about a month ago. Ive been doing some xbench benchmarks and have come to the conclusion that the internal 750 gig seagate is extremely slow. The only reason i benchmarked my mac was due to some performance issues i noticed when accessing the HD.
Comparing the results on Xbench seems to back up my results. It appears the WD 500g drive out performs the 750 by more than double the speed on most tests.
Has anyone else noticed this?
Tom
Disk Test 33.60
Sequential 95.22
Uncached Write 99.26 60.94 MB/sec [4K blocks]
Uncached Write 86.73 49.07 MB/sec [256K blocks]
Uncached Read 73.54 21.52 MB/sec [4K blocks]
Uncached Read 146.96 73.86 MB/sec [256K blocks]
Random 20.40
Uncached Write 6.38 0.68 MB/sec [4K blocks]
Uncached Write 75.05 24.03 MB/sec [256K blocks]
Uncached Read 52.28 0.37 MB/sec [4K blocks]
Uncached Read 145.46 26.99 MB/sec [256K blocks]

iTomW wrote:
Internal
WDC WD3200AAJS-40RYA0
WDC WD5000AAKS-40TMA0
Both seem to have faster uncached write times
That's strange. The WD5000AAKS should be faster than the Seagate on
large sequential reads and writes -- but only by about 10%. OTOH, the
Seagate should be about 10% faster than the WD3200AAJS.
WD doesn't specify sustained MB/s figures for either drive, so I can only
guesstimate the numbers based on Tomshardware's R/W measurements
of similar WD drives, plus WD's Mbit/s specs. (A simple divide-by-eight
doesn't work for translating from Mbit/s to MByte/s disk transfer rates.)
I'm curious as to how you're making the comparisons:
\- Are you swapping drives on the same iMac, or do you have several?
\- How full are each of the drives? Read/write speeds are fastest when
the drive is nearly empty and decreases significantly as it fills up. Data
density (bits per revolution) is highest at the outer edge of the platter.
\- What's the Seagate firmware rev? I'm aware of one firmware SNAFU
affecting some 500GB Seagate 7200.10 drives, but don't know whether
any of the 750GB models were also involved.
By the way thanks for the input
My pleasure. I'm interested in learning more about HD performance.
Looby

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