My SD card slot on the latest MacBook (Mid 2012) won't mount my SD card. The SD card doesn't appear in Finder, Disk Utility, Image Capture or anywhere. I know it's not a software problem, because nothing changed before and after. How do I fix it?

  • I can't post a new answer because of the protected status of the question. For me, blowing into the slot didn't work. I spoke to Apple support who suggested resetting NVRAM and SMC, and this does seem to have helped. In particular, it seems to be the SMC reset that helped.
    – PeterT
    Dec 11 '16 at 16:15
  • @PeterT Please make an edit to the main answer with your details - I will approve that addition if someone else doesn't do it before I see the edit.
    – bmike
    Dec 13 '16 at 18:09
  • Actually, I think I was just lucky the first time I tried after the SMC reset. The problem was always intermittent, and I guess likely more related to dust etc after all.
    – PeterT
    Dec 13 '16 at 19:17
  • @PeterT You have to blow really hard. Trust me. It works.
    – Andremoniy
    Oct 15 '17 at 14:19
  • 1
    @Andremoniy had a bit of a double take when that notification appeared on my phone; looked like spam out of context :)... Anyway, it works now, I don't know what fixed it.
    – PeterT
    Oct 15 '17 at 14:24

I blew hard in the SD card hub. Now it is working fine.

  • 20
    Wow. That worked! I guess we're back to the days of the NES.
    – hepcat72
    Oct 17 '15 at 13:36
  • 2
    Are you freakin' kidding me? How the heck did this work... I can confirm that this fixed the issue...
    – megamaiku
    Aug 17 '17 at 7:42
  • 3
    what the hell, can't believe am upvoting this 😂
    – Paschalis
    Feb 22 '18 at 11:19
  • 2
    Can confirm this works Mar 31 '18 at 9:43
  • Hahaha! This worked. Guess we have to keep an eye on dust build up with the card readers. Worked a treat on my iMac. Thanks. Jan 30 '19 at 12:56

This thread says that there's a switch in the SD card slot that detects when a card is inserted, and it can get clogged by dust or jammed or something. If you play around with a toothpick (or anything that fits in that hole), it'll fix your problem. Toggling that switch helps.

  • So your issue is fixed?
    – demure
    May 24 '13 at 15:38
  • 4
    Yeah. I only commented because it was a hard bug to find, and much prefer Stack Exchange over some random forum.
    – Scott
    May 24 '13 at 20:22

for me sticking the SD card in and pulling it a bit out again ( just a few mm ) seems to get it mounted. There's even a video that explains how to put it in and pull it out a bit here

But I find that putting it in under an angle works better: Sticking the card in under a angle with the cut off corner against the top of the SD slot and then pushing the card in seems to get it mounted every time.

  • 2
    +1 for sticking it in under and angle: works reliable up to this point.
    – 0x6d64
    Jan 6 '15 at 17:13
  • 1
    -1 for how ridiculous it is that you pay a premium for this hardware and then have to stuff like that Jul 27 '15 at 6:47
  • I wiggled the card while it’s in the slot and it appeared on the desktop. Great!
    – pointum
    Nov 8 '19 at 18:55

My Mac book stop seeing the cards, I used a can of air to clean out the reader and it works fine now.

  • Blowing compressed air into the SD slot on 2 of my MacBook Pros solved the problem. Thanks for that tip. I had tried everything else.
    – user84965
    Jul 14 '14 at 0:59

Maybe some dust is stuck in the card slot. To remove, gently blow into the slot and try to insert the card again.

  • Could you be slightly more specific.
    – dan
    Feb 2 '14 at 15:54

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