Canon EOS 7D - Manual (Page 29)

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Although the thickness is different between the two types of CF
(CompactFlash) cards, the camera is compatible with both types. It is
also compatible with Ultra DMA (UDMA) cards and hard disk-type
cards.
1
Open the cover.
Slide the cover as shown by the
arrow to open it.
2
Insert the card.
As shown in the illustration, face
the label side toward you and
insert the end with the small holes
into the camera.
If the card is inserted in the wrong
way, it may damage the camera.
X The card ejection button will stick out.
3
Close the cover.
Close the cover and slide it in the
direction shown by the arrow until it
snaps shut.
X When you set the power switch to
<1>, the number of remaining shots
will be displayed on the LCD panel.
Installing and Removing the CF Card
Installing the Card
Label side
Card ejection button
Shots remaining
The number of shots remaining depends on the remaining capacity of
the card, image-recording quality, ISO speed, etc.
Setting the [1 Release shutter without card] menu option to [Disable]
will prevent you from forgetting to install a card (p.256).