CHA / CHR
Nikon Camera
Severity: ModerateWhat it means
CHA means a problem with the memory card in Slot A.
CHR means a problem with the card being read.
The card may not be inserted, may be locked, corrupted, or incompatible.
Remove and reinsert the card, or try a different card.
Affected Models
- Nikon D850
- Nikon D780
- Nikon D500
- Nikon Z6
- Nikon Z7
- Nikon Z8
- Nikon Z9
Common Causes
- No card inserted in the active slot
- Card not fully seated in the slot
- Card lock switch is in the locked position
- Card corrupted or incompatible
- Card contacts dirty
How to Fix It
-
Make sure a card is inserted in the correct slot.
Dual-slot cameras may be set to write to a specific slot.
Check which slot is active in the menu. -
Remove and reinsert the card firmly.
Push the card in until it clicks.
A partially inserted card cannot be read. -
Check the SD card lock switch.
The small switch on the left side of SD cards must be in the unlocked position.
-
Format the card in the camera.
Menu > Setup > Format memory card.
This erases all data — copy photos to a computer first.
Frequently Asked Questions
What is the difference between CHA and CHR?
CHA specifically refers to Slot A (the first card slot).
CHR is a read error — the camera found a card but cannot read its data.
Can I use microSD cards with an adapter?
Technically yes, but adapters can cause contact issues.
For reliability, use full-size SD cards or the card type your camera requires.