Dell Venue 8 (7840, Early 2015) - Manual (Page 16)

16 | Setting Up Your Tablet
Removing the MicroSD Card
CAUTION: Removing the microSD card while it is in use may
cause data loss or result in application errors. Ensure all save
operations to the microSD card are complete before removing
the microSD card.
1 Touch → Settings→ Storage→ Unmount.
2 Confirm that you want to unmount the microSD card.
3 Insert a pin or paper clip into the hole on the microSD‑card tray
so that the microSD‑card tray pops out.
4 Remove the microSD‑card tray.
5 Remove the microSD card from the tray and push the tray back
into the card slot until it locks into place.