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It won't be due to Windows 10, at least unless you are using a very old version of Opus. Windows 10 is what almost all of us are using. (That said, Windows 10 can install some poor drivers by default, see below.)
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Try using the Copy Files button rather than drag & drop to see if that makes a difference.
In other words, get the folder you want to copy from in the left file display, and the one you want to copy to in the right. Then select some files to copy in the left, and click Copy Files.
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Are you running Opus elevated as administrator? The admin account/context may see drives differently to the standard one, which could cause problems.
If you are doing that: Instead of that, use the UAC support built in to Opus instead of elevating the whole program. See: Why NOT to run Opus as Administrator under UAC.
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Which Opus version are you using? Your profile says 10, which is very old now, but if you're using 11 or 12, what is this setting in Opus set to?
- Preferences / Miscellaneous / Advanced [Filesystem]: copy_nonbufferio_threshold
Try setting it to 0 (zero) if it isn't already. Other settings can cause trouble with some things which don't work correctly with non-buffered I/O.
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You could generate a Process Monitor log of what happens to see if that shines any light on what's going on:
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Make sure your drivers are up to date. Windows 10 can install some poor driver choices by default. The important ones for file copying are the ones that usually come from the device manufacturer's website for that device (or motherboard on custom-made PCs), in the downloads area: The motherboard/chipset drivers and the SATA drives.
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Other than that, there isn't really any reason Opus shouldn't be able to access the same drives that Explorer does.