Archived from groups: comp.sys.ibm.pc.hardware.storage (
More info?)
On Mon, 29 Aug 2005 23:10:13 GMT, "fj" <jelenko@att.net> wrote:
>
>"Russell May" <russmay@toastNotThis.com> wrote in message
>news:gih6h15klp15lslkmv1q60dkva5b4jdaro@4ax.com...
>> On Mon, 29 Aug 2005 13:01:17 -0400, "Peter" <peterfoxghost@yahoo.ca>
>> wrote:
>>
>>>
>>>"Russell May" <russmay@toastNotThis.com> wrote in message
>>>news:ia96h1lkg6tiq1p55c14bputjd8o3pb30n@4ax.com...
>>>> When I recently copied about 4.6GB from my AcomData 7200RPM USB 2.0
>>>> 60GB external disk drive to a Verbatim 16X DVD+R disk via my Plextor
>>>> PX-716A 16X internal drive, there were several pauses to replenish the
>>>> cache after it reached about 8X write speed. The copy operation
>>>> averaged about 400MB/minute. During verification, it paused again
>>>> several times after it reached about 8X read speed. I expected
>>>> something faster both directions. Copying the same data between from
>>>> an internal hard drive and the DVD drive results in no such pauses or
>>>> slowdowns, so I presume the USB 2.0 interface slows the operation.
>>>>
>>>> Is 400MB/minute normal for copying between a USB 2.0 hard drive and
>>>> internal 16X DVD drive? Is there something simple to improve it?
>>>>
>>>> Russell May
>>>>
>>>
>>>Did you try to copy same data between internal HD and USB 2.0 HD?
>>
>> Reading and writing the USB 2.0 HD subjectively seems a little slow:
>> Sometimes there are a few pauses while playing video on the USB drive.
>> Copying between internal HD and USB HD is significantly slower than
>> copying between internal hard disks, but I have not timed it. I have
>> just lived with it being a little slow. The USB performance became
>> more important when I got a DVD drive and larger internal HD.
>
>Russ - I find very little difference in copying from one internal harddrive
>to another vs copying from an internal harddrive to a harddrive in a USB 2
>enclosure.
>
>Just to confirm, did you measure the copy from the internal harddrive to the
>DVD?
>
>Also, how are you 'copying' to a DVD drive? Using packet writing with an
>RW?
>>
>> I did a little research and found this:
>> http://www.tomshardware.com/storage/20030116/
>>
>> The review is a couple of years older than my USB drive but I think
>> the enclosure is from the same manufacturer. The review shows even
>> lower write performance than what I got while copying to DVD, but
>> significantly higher read performance.
>>
>> My external drive also has a Firewire connection which might give
>> better performance. I have not tried it, but maybe I should do so.
>>
I timed several operations. I used only Verbatim 16X DVD+R disks.
Data were written from HD to DVD via "Nero 6 Ulta Edition" Burning
ROM. Data were written from HD or DVD to HD using copy and paste in
"My Computer". Data written from internal HD to internal HD were
copied and pasted between directories on the same partition. Data
total 4460MB (4,704,600,604 bytes) from 31616 files and 1604 folders.
Environment: OS=WinXP Home SP2, CPU=P4 2.4GHz, Mbd=Gigabyte 8IEXP,
memory=1.0GB ECC DDR, internal HD=Samsung SP2014N (200GB NTFS 7200RPM
ATA100, indexing enabled), external HD=Samsung SP6003H (60GB NTFS
7200RPM ATA100 in Acom Data USB/FW enclosure, indexing disabled),
DVD drive=Plextor PX-716A (16X ATA66), media=Verbatim 16X DVD+R,
antivirus=CA eTrust, antispam=Microsoft, #tasks=about 48,
applications=none except My Computer or Nero as applicable.
Copy times and rates:
From DVD to internal HD: 26min 10sec (about 174MB/minute)
From internal HD to internal HD: 9min 48sec (about 455MB/minute)
From internal HD to USB 2.0 HD: 10min 5sec (about 442MB/minute)
From USB 2.0 HD to internal HD: 10min 14sec (about 435MB/minute)
From internal HD to DVD: write 7min 55sec (about 565MB/minute)
verify 7min 17sec (about 612MB/minute)
From USB 2.0 HD to DVD: write 10min 5sec (about 442MB/minute)
verify 7min 20sec (about 608MB/minute)
I did not have enough time to measure from DVD to USB 2.0 HD.
Disabling Microsoft AntiSpam had no significant effect.
Snoozing (disabling) CA eTrust Antivirus had a significant effect.
From internal HD to internal HD: 7min 1sec (about 637MB/minute)
about 40% faster than with AV.
Writing to DVD was irregular:
From internal HD to DVD: Write operation paused four times to
replenish the read buffer at about 2'58", 3'10", 3'35", 7'15". Verify
operation started at about 4.9X, paused starting at about 25% progress
and 6.8X, varied irregularly from 960KB/sec to 8X until about 50%
progress, became regular again, finished at 11.8X.
From USB 2.0 HD to DVD: Write operation paused fifteen times to
replenish the buffer starting at about 2'10". It paused about every 30
seconds. Verify operation started at about 4.9X, went to 7.3X at about
25% progress, varied irregularly from there to about 32% progress,
became regular to about 56%, varied again to about 68%, went to 10.7X
there and became regular until about 97% progress, finished at 11.3X.
Plextools Professional Write Transfer rate test results were irregular
DVD disk #1: Write Transfer rate started at 6.76X, went to about 14X
at 3.1GB, dropped to steady 12.23X there, dropped to
steady 4.07X at about 3.6GB, finished at 4.07X.
DVD disk #1: Simulated Write started at 6.76X, dropped to steady
12.23X at about 3.3GB, finished at 12.23X.
DVD disk #2: Write Transfer rate started at 6.76X, went to about 14.5X
at 3.6GB, dropped to steady 12.23X there, finished at
12.23X.
DVD disk #2: Simulated Write started at 6.76X, finished at 16.29X.
Plextools Professional Read Transfer rate test results were regular
for both DVDs: Read transfer rate started at 4.93X, ended at 11.81X.
Writing an image of the internal HD (about 27GB) to the USB 2.0 HD
using Ghost 2003 averages about 410MB/minute, fills up the USB HD.
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