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On Windows 8, I have mapped a network drive to Z:, which resides on a Mac computer on my homegroup on my gigabit network. When I mount a disk image (roughly 10 GB) on the network drive, such as an ISO file for an application, and then install it, the image unmounts after about a minute.

How can I stop it from unmounting? The Mapped Network Drive itself does not disconnect; only the disk image is unmounted.

I think that specifically in my case, the problem has to do with the fact that I am mounting a large disk image over a network. Because if I simply copy the 10 GB file to my local computer, then it finishes. So, how do I mount a large disk image over a network, and install a program from it?

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2 Answers 2

up vote 1 down vote accepted

I would recommend to increase the CIFS timeout.

Please check this:


Looking forward to hearing from you

Kind Regards


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This looks like your first post here. And it's an incredibly useful one! In particular, the "Client session timeout" section is relevant. I had to create the "SessTimeout" key because it didn't exist for me (I think it was defaulting to 45 seconds). I created it as a REG_DWORD, with a Decimal value of 600 (for 10 minutes), and that did the trick! It takes effect immediately, so no restart or even re-connection to the share necessary. Do you know if there are any downsides to increasing this value to such a high number? I guess it just keeps the connection open longer? –  Gary Jul 15 '13 at 16:54
Thanks for your nice comment. I hope I can continue contributing to this great forum. –  Gonzalo Murillo Jul 23 '13 at 6:57

I believe that on windows, it has been my observation that when a network attached drive is idle after some period of time, then it is disconnected from the network. However, when use resumes, it will reattach. All perfectly normal.

Thus I am not sure of your issue, is it that the drive never reconnects.

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In my particular case, I'm trying to mount a large disk image (10 GB) over a network, and install a program from it. However, the image is unmounted after about a minute, and I'm not sure why. Copying the disk image to the local computer and installing it via that method works fine, of course, but I'd like to avoid the step of copying it if possible. –  Gary Jul 15 '13 at 4:51

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