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On several Windows 7 boxes I'm having trouble with very large files. On my external hard drive I have a 2.2 GB Executable (extractor) as well as a 2.3 GB 7z file. However when ever I want to go to the folder I have to wait about 3 minutes before I can run the executable. During this time my hard drive activity light is going crazy, while I see little processor or RAM activity.

I can replicate this on multiple Windows 7 boxes ranging from Dual core Pentium E5300's with 2 GB RAM to a box with Dual Core Xeon Processors, 4 GB RAM, and RAID 0 HD's. It doesn't even make a difference when I use the internal HD instead of an external. This also happens when viewing a directory with a large amount of high resolution pictures. In all cases the HD activity light is going crazy, while explorer is either unresponsive or the program I'm running won't open.

Any suggestions?

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i experience a similar situation. I have a 1TB drive with many files of various sizes and types in many folders and sub-folders. If i do not use the drive for a while then when i access it or save to it the active window will hang for 10 seconds or so. i always assumed that since the drive is in-frequently used that windows was putting it into a low power state and that the delay was just the time it took for the drive to "wake up". perhaps it is something else though – Xantec Nov 8 '10 at 15:40
See also for slow folder browsing:… – Jonathon Jun 29 '12 at 14:17
up vote 1 down vote accepted

I think you're running into an antivirus scan. If it detects it as a compressed file, it might actually be scanning the contents every time you access it. Try exclude the file from your scanner settings and see if that helps.

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Will try, although the Pentium E5300 computer is a company computer and uses Mcafee Enterprise, so I can't exclude it there unfortunately. I will test though on the other machine. – TheLQ Nov 8 '10 at 23:18
It's an interesting problem, so I'll keep an eye on this question. – user3463 Nov 9 '10 at 0:03

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