JPG Thumbnails problem in Windows

[michaelc]

I am using QNAP TS-469 Pro and the latest 3.7.3 firmware. I have created and share a folder in the NAS and mapped into a drive in Windows 7 that contains thousands of JPG photos, however I noticed I am not seeing the thumbnails of the JPGs when viewing using Windows Explorer. Does anyone has the same problem and how to resolve this? I am totally a newbie in NAS and QNAP, appreciate all advices and help!

Thanks.

[schumaku]

In general a Windows (Vista, 7, 8 ) Explorer does dynamically generate the thumbnails for the currently listed files by reading and processing every single image or PDF file. The progress is made visible in the green progress bar under the Explorer path - no problems here on folders with some hundred jpg photo files (5..10 MB each).

For a while, Windows does no longer gnerate thumbs on network shaes, so I think we can ignore this issue. This caused sosme nasty probel,s on renaming directories for example.

There are some more or less strange explanations in the net - all appear to be more connectivity issues, ie. some refeences state to disable some off-load from certain network cards, othrs sugget to disable some dynamic Windows TCP/IP stack tuning (disable it is deprecitated IMHO).

Wen cocpy jusst one or very few files into a test directory - any diffeence?

Anyhting that might be specific to these JPEG files, ie. size, resolution, ...?

Any performance issues with the NAS, or using some kind of port trunking not working properly?

[michaelc]

hi Schumaku,

Thanks for the reply and help. It is not entirely correct that I cannot see ALL the thumbnails at all, I would say there will be approx 5% of the JPGs displayed in thumbnails and not the rest, pressing F5 to refresh will not help. Interestingly when I "cursored" over the image and press F5 to refresh the page, the thumbnail shows for that image! I tried on a directory that has 10 images and another that has thousands, results are the same. I am a bit lost on this as I do not have any problems if the directory is in my local HDD, the problem just happens over the NAS.

Thanks.

[schumaku]

Windows Explorr works different when it comes to thumbnail handling for local image folders vs. images on network share folders. Locally, there is a thumbnail store maintained.

Microsoft has abandoned the cration of a thumbnails cache on network shares a long time ago already. All newer Explorer are dynamically creating thumbnails from network shares, and do just caching ot some extent.

Do you see the green progress bar behid the path information as in the example blow?

Windows_Explorer_thumbnail_loading.PNG

When Explorer is not able to generate and show the thumbnails, this is most likely a networking or connectivity issue - reliability, bandwidth, ..- or related to the high number of images, or potentially to the sisze and/or the format of fthe files.

I doubt this is a NAS issue at all.