Re: Transfer rates of external USB 2.0 hard drive revisited

From: tholen@xxxxxxxxxxxx
Date: 02 May 2007 19:58:34 GMT

Joe Negron writes:

For each test I removed the partition with LVM, recreated it at the
beginning of the free space, formatted it as JFS (5120 MB partition),
rebooted, then timed the copy of one 4 GB file to the USB HD.

Were they just a single test or an average of multiple trials?

Neither. Most of them were single tests - a few times I re-ran a test
to confirm the results (always the same within a few tenths of a
second).

Interesting.

I'm usually reluctant to accept the results of a single test on
a multitasking operating system,

If you're interested you could test it yourself.

I've done timing tests before, and I've always run them multiple times,
and the results are rarely perfectly consistent.

because other things can be going on in the background, and it's hard to
predict when they might be stealing CPU cycles or disk accesses. Even if
the test program is the "only job" running, the operating system itself
can introduce irregularities.

If one accepts that premise then what's the use of benchmarking on a
multi-tasking OS?

The use is in getting meaningful results. An average of a large number
of tests can indeed be meaningful, even when a single test isn't that
meaningful.

In my case, I removed everything from the startup folder and waited
until the INI files were flushed.

How is that determined? Waiting for the disk activity LED to stop flashing?

.

Follow-Ups:
- Re: Transfer rates of external USB 2.0 hard drive revisited
  - From: Joe Negron

References:
- Transfer rates of external USB 2.0 hard drive revisited
  - From: Joe Negron
- Re: Transfer rates of external USB 2.0 hard drive revisited
  - From: tholen
- Re: Transfer rates of external USB 2.0 hard drive revisited
  - From: Joe Negron

Prev by Date: Re: Problem after converting FDisk Partitions to LVM
Next by Date: Re: PCMCIA Adapter for SD cards: Which one, and how?
Previous by thread: Re: Transfer rates of external USB 2.0 hard drive revisited
Next by thread: Re: Transfer rates of external USB 2.0 hard drive revisited
Index(es):
- Date
- Thread

Relevant Pages

Re: RUNNING OUT OF SPACE IN HARD DRIVE
... Partition C = 20GB for the operating system. ... Drive C's properties reports 2.8GB of free space. ... I have deleted temporary files and also run the tool to free space and I ...
(microsoft.public.windowsxp.perform_maintain)
Re: Hard drives partition is not showing the exact free space..
... MFT file will take considerable part of your NTFS partitioned drive space ... the partition is which my operating system is ... residing is not showing the exact free space. ... the full size of my partition is 4.0 GB. ...
(microsoft.public.windowsxp.hardware)
Re: HELP!
... The minimum system requirements call for at least 20GB of free space on a 40GB partition. ... everything goes smoothly until it gets to "completing install" ... so now, i cant install an operating system, and my past operating system is ...
(microsoft.public.windows.vista.installation_setup)
Re: when there are already several partitions
... resize and then repartition the resulting free space. ... The hard-disk partition table contains two inconsistent descriptions ... of sectors on the hard disk. ... operating system use the hard disk. ...
(alt.os.linux.suse)
Re: Transfer rates of external USB 2.0 hard drive revisited
... beginning of the free space, formatted it as JFS (5120 MB partition), ... I'm usually reluctant to accept the results of a single test on ... program is the "only job" running, the operating system itself ...
(comp.os.os2.setup.storage)