64gb flash pen.

Where did you purchase Flash Pen....just in case this is related: Don't fall for the Flash Drive Scam!

ok, that's good practice.

See post# 5: I wanted to know if you can see the files using a directory command in a command prompt.

I'm a little confused as to the issue you're trying to solve. I thought that it pertained to files in a folder, but in post# 13 you mention putting them in a document.

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Ianisth said:

Hi, I remove in safemode.

I don't know what you're talking about in the last part of your email sorry.

Flash drives larger than 4GB are very slow, so there might be more latency in writing the files.

Ianisth said:

How can I tell if the GB is fake? It says in the properties that its capacity is 62.4GB.

I would try this tool: Bart's Stuff Test 5

it is a windows xp tool though so not sure if it will run in win7

This will read/write to the drive to fill it to capacity and report back when it reaches a limit. if it is fake and has an actual capacity of say 4GB then it won't write past that. the fakes trick windows and other programs into looking like it is a higher capacity. It can even register as a name brand even if it isn't.

I would also heed Slartybarts suggestions. when you write to a flash drive, even if windows says it is finished, it is not necessarily finished. it has the remaining data being written and if ejected improperly, will not finish sending the data.

can you copy small files that should take less than a few seconds to the drive and then see if they don't show up when ejected and re-inserted?

Still confused on the folder issue with copying them within a folder. maybe windows is just copying the folder location, but not copying the actual files even though they appear to be in there on the flash drive. does this happen on other flash drives as well or just this 64GB drive?

I'm not clear on the problem. In the OP's original statement, he says files written to the USB drive disappear. The OP now says the files aren't written to the USB drive when included in a doc file. If this is MS Office Word, the files will be included in the doc file itself unless the "by reference" is selected. The size of doc file includes the file(s) and won't be shown individually.

I would like a more detailed explanation of the problem and during what operations.

Testing for the fake drive on a 64 GB drive is gonna take quite some time.

So far there is no indication that such a test is required.

If a file was copied and lost because the real capacity of the drive was less than what was advertised, then it would be lost no matter where it was copied, inside or out.

So go ahead with whatever easy things Slartybart wants you to perform to diagnose the problem.

I am stepping aside and will only watch.:)