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From: Bob I on 13 Aug 2010 11:05
I prefer Copy and Delete to preclude issues like this. With the amount
of files being moved if you hit a bad file on the source, things can get
ugly in a hurry.

void.no.spam.com(a)gmail.com wrote:
> OK I will run chkdsk on both the hard drive and the USB hard drive.
> Doing a compare is something I would have tried if I had done a copy
> operation, but since I did a move operation, I cannot do that.
>
> On Aug 12, 1:37 pm, Bob I <bire...(a)yahoo.com> wrote:
>
>>CHKDSK should suffice to determine whether the data was written and a
>>simple compare of the "files and folders" count plus "total bytes"
>>should tell you if the files made the trip.
>>
>>void.no.spam....(a)gmail.com wrote:
>>
>>>By later in the day, I meant several hours later. I wasn't sure how
>>>the cache gets flushed - if it is time based, or if it doesn't get
>>>flushed until the next time you try writing to the device. As for
>>>checking the data, it was about 40 hours worth of videos that I
>>>transferred - it'd take quite a while to verify that!
>>
>>>On Aug 12, 8:24 am, Bob I <bire...(a)yahoo.com> wrote:
>>
>>>>You could have corrupted data without Windows Explorer "crashing". If by
>>>>"later in the day" you mean a even few minutes later, it's most likely
>>>>the "cached data" was flushed/written. Any "corruption" would be
>>>>unrelated to the file transfer. You can always check it.
>>
>>>>void.no.spam....(a)gmail.com wrote:
>>
>>>>>Using Windows Explorer, I moved several gigabytes of data from my hard
>>>>>drive to a USB drive. Then later in the day, Windows Explorer crashed
>>>>>- it said something like "Windows Explorer has encountered a problem
>>>>>and needs to close" and it also mentioned the possibility of losing
>>>>>data.
>>
>>>>>I know that sometimes when you copy stuff to a USB drive, not all the
>>>>>data will get copied immediately, due to caching, and that's why you
>>>>>need to click the "Safely Remove Hardware" icon before you unplug the
>>>>>drive. I never clicked on that after I moved my files, because I just
>>>>>left the USB drive plugged in. Is it possible that data on my USB
>>>>>drive may have been corrupted by Windows Explorer crashing? I would
>>>>>imagine that the caching mechanism is a lower level function that
>>>>>wouldn't be impacted by an application crashing, but then maybe
>>>>>Windows Explorer is deeply tied into the OS, so I don't know.
>
>

From: Yousuf Khan on 13 Aug 2010 13:25
On 12/08/2010 11:14 AM, void.no.spam.com(a)gmail.com wrote:
> By later in the day, I meant several hours later. I wasn't sure how
> the cache gets flushed - if it is time based, or if it doesn't get
> flushed until the next time you try writing to the device. As for
> checking the data, it was about 40 hours worth of videos that I
> transferred - it'd take quite a while to verify that!

In a continuous operation like that, the cache gets flushed when memory
gets full. Depending on how many gigs of ram you have, that could be
anywhere from 30 seconds to a few minutes each.

Yousuf Khan
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