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Odd file copy behaviour



 
 
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  #1  
Old February 20th 18, 11:08 PM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default Odd file copy behaviour


Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?

Anyone got any ideas why it happens?
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  #2  
Old February 21st 18, 12:19 AM posted to alt.windows7.general
philo
external usenet poster
 
Posts: 4,807
Default Odd file copy behaviour

On 02/20/2018 04:08 PM, pjp wrote:

Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?

Anyone got any ideas why it happens?




Maybe something here would help


https://superuser.com/questions/8587...-the-same-time
  #4  
Old February 21st 18, 05:17 AM posted to alt.windows7.general
Diesel
external usenet poster
 
Posts: 937
Default Odd file copy behaviour

pjp
Tue, 20
Feb 2018 22:08:04 GMT in alt.windows7.general, wrote:

Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard
disk on the local pc. This 2nd copy finishes much sooner than the
first going by the "details and amount left to copy and speed of
copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so
does the networked copy. e.g. both dialog boxes disappear and both
copies appear to have finished correctly!!! The networked copy is
obviously not correct when one tries to play it and in fact
Explorer cannot even display it's playtime length. Do another copy
by itself over it and this copy is done correctly.

Anyone else ever notice this behaviour?

Anyone got any ideas why it happens?


I last observed that on NT4, years ago. I thought it had been
corrected, ages ago. Once I was able to repeat the error on my NT4
machine, I stopped using copy/paste in that manner and switched to
xcopy/xxcopy for more reliability. I also noticed they were faster in
doing the task for me. I'm somewhat surprised to learn that bug
might? still be present in a far later/greater OS as claimed by MS.

--
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  #5  
Old February 21st 18, 05:32 AM posted to alt.windows7.general
B00ze
external usenet poster
 
Posts: 472
Default Odd file copy behaviour

On 2018-02-20 17:08, pjp wrote:

Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?
Anyone got any ideas why it happens?


Yeah, you asked about this on Jan 30th. No idea why it does this; could
it be caused by your Anti-Virus? I'd have to do tests here to see if I
can reproduce, never really noticed this, but I don't really copy the
same files twice at the same time (altho I do sometimes run multiple
copies of different files concurrently.) If it is not the Anti-Virus and
it's a bug in Explorer, I can't say I'm totally surprised lol.

Best Regards,

--
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oO-( )-Oo Olive oil comes from olives; where does baby oil come from?

  #6  
Old February 21st 18, 05:36 AM posted to alt.windows7.general
Bob_S[_2_]
external usenet poster
 
Posts: 149
Default Odd file copy behaviour

"pjp" wrote in message
...


Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?

Anyone got any ideas why it happens?



Yes. Try reversing the order. Start the copy to the internal drive first
then the external drive. As I recall It's a race (buffer) situation on the
bus but I can't remember exactly what the cause was but it didn't happen on
smaller files. You didn't mention the age of the hardware or configuration
but as I recall it was on Dell hardware (???) but that was several years
back.

So try reversing the order and test the original way using some smaller
files. It doesn't run out of buffer space as fast. What type of drives are
you using and what is the path to the 2nd PC? Wireless router, switch,
direct connect...?

--

Bob S.

  #7  
Old February 21st 18, 05:49 AM posted to alt.windows7.general
Paul[_32_]
external usenet poster
 
Posts: 11,873
Default Odd file copy behaviour

pjp wrote:
In article , says...
On 02/20/2018 04:08 PM, pjp wrote:
Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?

Anyone got any ideas why it happens?



Maybe something here would help


https://superuser.com/questions/8587...-the-same-time

Might be work arounds but so is just copying the file one after the
other rather than simulatneously.

Question is still WHY? The OS shouldn't be doing that.


I did a quick test here back when you first reported this
and could not reproduce it. Consequently, there was nothing to
report back to you.

Obviously, Explorer should not do this.

I could understand it happening, if the completion of one
transaction... caused Explorer to crash )which might take down
a second copy in flight). But I think you would notice and
recognize the symptoms of an Explorer crash if you saw one.

I've had Explorer crash on WinXP a ton of times. I've also had
a file transaction (15GB file copy) take out the OS and cause
a BSOD - the root cause on that one was actually bad RAM, in
whatever area the buffers live in. Replacing the RAM stopped
that one, and it hasn't come back. But Explorer can still crash.
Sometimes it crashes when I exit the last program on the desktop.
The problem is intermittent.

Paul
  #8  
Old February 21st 18, 07:10 AM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default Odd file copy behaviour

In article , says...

On 2018-02-20 17:08, pjp wrote:

Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?
Anyone got any ideas why it happens?


Yeah, you asked about this on Jan 30th. No idea why it does this; could
it be caused by your Anti-Virus? I'd have to do tests here to see if I
can reproduce, never really noticed this, but I don't really copy the
same files twice at the same time (altho I do sometimes run multiple
copies of different files concurrently.) If it is not the Anti-Virus and
it's a bug in Explorer, I can't say I'm totally surprised lol.

Best Regards,


Anti-virus is MS's own Microsoft Security Essentials with nothing else
running so doubt it's anti-virus.

It does not seem to happen when copying different files nor does it
happen if I copy the same file at the same to to multipule
external/internal. Just the copying to another PC.

I have not tested if the same thing happens on other pcs also. Both
times I've explicity seen it happen was always from one specific Win7 pc
to the same "both times" second Win7 pc.

I've also not tested if it happens every time ... yet?

It does seem that if it's a group of multipule small files the issue
isn't apparent.
  #9  
Old February 21st 18, 07:32 AM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default Odd file copy behaviour

In article , says...

"pjp" wrote in message
...


Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?

Anyone got any ideas why it happens?



Yes. Try reversing the order. Start the copy to the internal drive first
then the external drive. As I recall It's a race (buffer) situation on the
bus but I can't remember exactly what the cause was but it didn't happen on
smaller files. You didn't mention the age of the hardware or configuration
but as I recall it was on Dell hardware (???) but that was several years
back.

So try reversing the order and test the original way using some smaller
files. It doesn't run out of buffer space as fast. What type of drives are
you using and what is the path to the 2nd PC? Wireless router, switch,
direct connect...?


Well both pc's are Dell's. One's a 2.8Gz dual core other is a 3.0Gz dual
core. The order of which started first may be why I've only noticed it
actually happen twice now although it explains why occassionally there's
a bad file copy.

This 2nd copy if almost always large files I store on a pc for a friend
drops by and grabs the media. He has no internet or tv so I'm kinda his
tv. I keep a folder I store the stuff in until he gets by to make it
easier to keep track of what's for him. The specific pc used as the 2nd
storage location is in the sunporch as far away from main pc house
allows but makes it easiest when he does drop by to just copy to a
flashdrive and he leaves happy.

I also keep most "newer" items available online for some time so any pc
in house can access them. This is done using a number of external drives
and shared folders. This duplication is why sometimes I have two copies
of same file going at same time. Every tv in house has a pc using TV-Out
for older analog tvs or HDMI fornewer tv hooked up to it and as well
some sort of stereo for music.

Both drives are spinners on the two pcs involved, a WD 1Tb source and a
WD 250Gb destination both Sata. Connection is wired going through a
router (2 pc and 2 switches from it) to a switch (with three devices on
it) onto a second switch (with 3 devices on it) to the second pc.

I should note the second switch is actually a dummied down to act like a
switch router. I did this to extend wireless in the house and to get
outside coverage somewhat in summer (tin siding on house, "master"
router in basement). The two "routers" use different SID's so you can
select which has strongest signal and know which is which. It will also
work using same SID but then you can't tell which one you are actually
connecting to. The wireless is for a couple laptops and guests phones
etc. I'me very rural area and often they can't get any other connection.
I do not use any security on the Wi-Fi. Basically you'd have to park in
my driveway to pick up the signal and I think I'd notice that LOL Plus
when kids were young their Gameboys didn't seem to be able to handle any
kind of router security so it was easiest and for me as safe a choice as
any.
  #10  
Old February 21st 18, 07:36 AM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default Odd file copy behaviour

In article , lid says...

pjp wrote:
In article ,
says...
On 02/20/2018 04:08 PM, pjp wrote:
Ok, this is the 2nd time I've explicitly seen this happen.

I'm copying a large file (1Gb) to a second pc's shared folder.

As that's going on I also start to copy the file to a 2nd hard disk on
the local pc. This 2nd copy finishes much sooner than the first going by
the "details and amount left to copy and speed of copy" dialog.

Thing is when this 2nd copy to the local hard disk finishes so does the
networked copy. e.g. both dialog boxes disappear and both copies appear
to have finished correctly!!! The networked copy is obviously not
correct when one tries to play it and in fact Explorer cannot even
display it's playtime length. Do another copy by itself over it and this
copy is done correctly.

Anyone else ever notice this behaviour?

Anyone got any ideas why it happens?



Maybe something here would help


https://superuser.com/questions/8587...-the-same-time

Might be work arounds but so is just copying the file one after the
other rather than simulatneously.

Question is still WHY? The OS shouldn't be doing that.


I did a quick test here back when you first reported this
and could not reproduce it. Consequently, there was nothing to
report back to you.

Obviously, Explorer should not do this.

I could understand it happening, if the completion of one
transaction... caused Explorer to crash )which might take down
a second copy in flight). But I think you would notice and
recognize the symptoms of an Explorer crash if you saw one.

I've had Explorer crash on WinXP a ton of times. I've also had
a file transaction (15GB file copy) take out the OS and cause
a BSOD - the root cause on that one was actually bad RAM, in
whatever area the buffers live in. Replacing the RAM stopped


Both these pcs pretty stable, days if not weeks running 24/7. Usually
power outage takes em down with Updates restarting them is all. The 2nd
pc is actually almost exclusively used to watch video on tv and play
music thru a stereo. I seldom even use the kepboard on it and it stays
tucked away almost always. Only oddity about this 2nd pc is that it
doesnt' behave well as a Master Browser which may have some pertinence
but I'm not into it that much to figure that kind of an issue thru.
 




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