The diskutil command on macOS is incredibly powerful and can do all that you need. (You can run the following in the Terminal app.)
Find your SD card:
$ diskutil list
$ diskutil list external physical
On the right, under IDENTIFIER, you'll see your disk labeled like disk2 or disk3, etc. You can use that label to reference your SD card from now on....
A better and simpler solution would be using the command-line.
Execute the following command to identify the mount name of SD card following the pattern /dev/diskX, e.g., /dev/disk2
Say the disk name is /dev/disk2. Now format the card to FAT32 by running the following command:
sudo diskutil eraseDisk FAT32 MYSD MBRFormat /dev/disk2
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.
Assuming Disk Utility doesn't work, try formatting the card using the SD Association's official formatting utility. It may seem a bit silly to download a program just for formatting SD cards, but I've had it fix all sorts of strange errors when nothing else worked, including disk utility / diskutil.
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 ...
diskutil unmountDisk /dev/diskX (X is number of disk from step 1)
sudo dd if=/dev/urandom of=/dev/diskX bs=1000000 (X is number of disk from step 1)
Then wait! You can press ctrl + t to see dd status.
Do you happen to have the Android File Transfer application installed? Various users on macrumors have noted the same issue, and have narrowed it down to having AFT installed.
I'm getting the same problem, and I too have AFT installed, but I won't be removing it any time soon as it's the only way to get anything to/from my Android devices.
I had a PNY 32gb SD Card. Spent hours trying to find out how to make it re-writeable. Well the answer is simple. The slider on the left side of the card must be "up" (the read-writable position) BUT ALSO the tiny "notch" opposite the slider must be covered with a piece of tape. It's really the opposite of the old video tapes, which we had to break the tab if ...
The following procedure should format your SD card to make it usable again and cause bad sectors on the card to be remapped if that is part of your problem. Warning, erasing the wrong drive could make you cry so make sure that you know what you are doing.
Before inserting the SD card into your Mac, make sure that the write protect (lock) switch is turned ...
Yes! You can change the volume from a removable device to a fixed disk by flipping the removable bit. Lexar made an application for Windows called 'Lexar BootIt', a well known application for this task.
I found a solution involving DD, but I have not tested it and I'd severely recommend backing up your card before doing anything with DD/Terminal. I created ...
This will erase all data that currently exists on the SD card:
Remove your SD card.
Open Disk Utility.
In the menu bar, click [View] > [Show All Devices].
Insert your SD card, ensuring the write-lock switch is in the unlocked position (towards the side of the card which has the gold contacts). You should see your SD card appear in the sidebar in Disk ...
In the half-dozen or so instances where I've seen this specific error, the micro SD card itself had gone bad and couldn't be formatted on Mac, Windows or Android (via OTG), even with different card readers. Not only couldn't the card be formatted, but files couldn't be added or deleted nor anything else that required writing to the card. (Reading files was ...
Get a piece of card / paper
Cut it out into an L-Shape and fold the _ of the L in half
Get somebody else to hold the computer up so that the CD drive is facing down
Put the piece of paper into the CD drive from the top and slowly, bring it down
When you reach the bottom of the drive, pull the paper out, gently and slowly.
The SD card should come ...
Most Android phones format exFAT SDcards incorrectly, the BlackBerry Priv being the only one I know that does it correctly. All other Android devices create a partition of type 12 (sometimes referred as hexadecimal "c") instead of 7. The android device actually ignores the partition type, so if you set it to 7 then the sdcard will work fine everywhere.
Make sure "Show External Disks" is enabled in Finder. Here's how:
Open Finder, Click on 'Finder' on the top bar and select preferences.
'This should bring up the Finder Preferences box. Under the first tab (General) make sure 'External disks' box is ticked.
Under the third tab (Sidebar) 'Show these items in the sidebar' scroll down to 'Devices' and make ...
I've been using SD cards more and more just as you mention and I think you'll be ticked with the benefits of having double the storage.
Here are the tools I use to get the data I need on relative speeds so I can choose what should be stored on the drive and what shouldn't go there.
Blackmagic Disk Speed Test
The Daisy Disk tool is really ...
I would install the older OS to another USB drive so that you can verify that the new OS is really causing the issue and it's not a hardware failure.
When you boot to the old OS (hold option key when booting to choose which OS of the ones connected) run diskutil list to check the filesystem on the SD card.
It's unlikely that it's a format that's no longer ...
I'll try a short step by step method:
find the device identifier of the memory card, it will be smthg like /dev/diskX
The format command is:
diskutil eraseDisk FILESYSTEM CARDNAME DEVICEIDENTIFIER
This will reformat the disk DEVICIDENTIFIER with one partition with file system FILESYSTEM and give it the name CARDNAME....
Image Capture manages which app is launched for a device. You can disable this functionality entirely by running the following then logging out:
defaults write com.apple.ImageCapture disableHotPlug -bool TRUE
Can you? Yes.
Is it wise? Perhaps not.
Flash storage is notoriously frail. Once it fails, that's, it, it's gone, usually taking everything on there with it.
The adage "Any data not stored in at least three distinct locations ought to be considered temporary" is not one to take lightly.
Other than that - it will run like molasses from an SD card.