Microsoft will release an update for Windows 10 on the next Patch Tuesday (May 10th, 2016) that fixes a photo import issue in the system's official Photos application.
The bug prevents some memory card readers from working properly when the Photos application is being used (which it is by default).
Particularly, SATA-attached readers, which you find used by multi-slot readers and on many laptops, don't work from within the Photos application while USB connected readers, USB Card readers or direct USB connections, work fine.
Support threads on Microsoft's official Answers forum highlight the frustrating issue with users stating that they cannot import photos to their Windows 10 device from their camera or card readers.
The memory card readers are listed by the Windows 10 operating system and many users help themselves by importing photos using the operating system's File Explorer application instead.
While that gets the photos on the PC, the transfer rate when using File Explorer is a lot worse than the transfer rate that the Photos application gets. The reason for this is that the Photos application uses a new API which improves transfer speed during imports significantly.
A transfer test of 1700 photo and video clips using an iPhone 6s connected to devices running Windows 10 using File Explorer and the Photos app, and the import tool on Windows 7 highlights the issue:
It shows that the new Windows 10 Photos api improves the import transfer speed significantly, and that Explorer transfers are roughly 10 times slower on Windows 10 when compared to the Photos application import, and four times slower when the import tool on Windows 7 is being used.
The patch corrects the SATA card reader bug that Windows 10 users experience when they connect certain memory cards readers to PCs running the operating system.
The patch is already live on Insider Builds of Windows 10.
Photo importing on Windows 10 had quite a few problems associated with it (all listed fixed by now, on May 10th, or with the Anniversary Update this Summer):
The last two issues are corrected in the API and will be available with this Summer's Anniversary Update (already available on recent Insider Builds).
Takeaway: If you want to import photos on a device running Windows 10, use the official application as it is a lot faster this way.
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