SD Card is Read Only?

chrisandersen

macrumors 6502
Original poster
Sep 6, 2008
324
7
I purchased a new 32 GB SD card today and stuck into my laptop and cannot write to it. It says it is read-only. This is what disk util reports:
2014-03-28 21:07:49 -0500:
Name : APPLE SD Card Reader Media
Type : Disk

Partition Map Scheme : Master Boot Record
Disk Identifier : disk2
Media Name : APPLE SD Card Reader Media
Media Type : Generic
Connection Bus : USB
USB Serial Number : 000000009833
Device Tree : IODeviceTree:/PCI0@0/EHC2@6,1
Writable : No
Ejectable : Yes
Location : Internal
Total Capacity : 31.91 GB (31,914,983,424 Bytes)
Disk Number : 2
Partition Number : 0
S.M.A.R.T. Status : Not Supported


2014-03-28 21:09:13 -0500: Verifying volume “NO NAME”
2014-03-28 21:09:13 -0500: Starting verification tool:
2014-03-28 21:09:14 -0500: Checking file system
2014-03-28 21:09:14 -0500: ** /dev/disk2s1

2014-03-28 21:09:14 -0500: ** Phase 1 - Preparing FAT

2014-03-28 21:09:14 -0500: ** Phase 2 - Checking Directories

2014-03-28 21:09:14 -0500: ** Phase 3 - Checking for Orphan Clusters

2014-03-28 21:09:14 -0500: 97 files, 31151424 KiB free (973482 clusters)

2014-03-28 21:09:14 -0500: MARK FILE SYSTEM CLEAN? no

2014-03-28 21:09:14 -0500:

2014-03-28 21:09:14 -0500: ***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****
 

noodle654

macrumors 68020
Jun 2, 2005
2,065
19
Never Ender
it is in the un-locked position. Tried it the other way and it is the same.
I've had thus happen a few times. Sometimes dust can get in the SD slot so not all the pins make contact. Blow some canned air in there then try again. Sometimes you have to give it a little force. Also repair the card in Disk Utility.
 

chrisandersen

macrumors 6502
Original poster
Sep 6, 2008
324
7
Tried the canned air trick with no luck. Took it to my iMac and it does report as read/write. Wrote a file to it successfully. Erased in disk util. It is setup as MSDOS FAT32. Took it back to MacBook Pro and it is the same, read-only.
The problem is I need to take the laptop into the field and program some panels with the SD card.
So, is it the laptop's card reader?

----------

This is what the laptop reports in disk util
Name : 32GB
Type : Partition

Disk Identifier : disk2s1
Mount Point : /Volumes/32GB
File System : MS-DOS (FAT32)
Connection Bus : USB
Device Tree : IODeviceTree:/PCI0@0/EHC2@6,1
Writable : No
Capacity : 31.91 GB (31,910,789,120 Bytes)
Free Space : 31.9 GB (31,900,303,360 Bytes)
Used : 2.7 MB (2,654,208 Bytes)
Number of Files : 0
Number of Folders : 0
Owners Enabled : No
Can Turn Owners Off : No
Can Be Formatted : Yes
Bootable : No
Supports Journaling : No
Journaled : No
Disk Number : 2
Partition Number : 1
 

MCAsan

macrumors 601
Jul 9, 2012
4,524
410
Atlanta
If you purchased the SD for use in a camera or other device, format it in that device. Always format CF or SD cards in the cameras. Then only read them in the laptop/desktop. Once read...back to the device for formatting and collecting the next set of images.

For use moving data between computers, you might want to use an USB stick. Most computers will have a USB 2 or USB 3 port and not need any external reader.
 

chrisandersen

macrumors 6502
Original poster
Sep 6, 2008
324
7
This is a special application where I must put some text in a .txt file and then move it to an alarm panel to insert the text onto the LCD screen of the alarm. They want it to be in windows, so the MS-DOS is probably correct. I went ahead and ordered a cheap USB2 dongle thingy.
 

g4cube

macrumors 6502a
Apr 22, 2003
760
13
COuld be that the laptop is older and does not support higher capacity SD card.

What type of SD card? SDHC or SDXC?
What model laptop?

The fact that the card works fine in your iMac leads me to suspect you have an older laptop that does not support the newer SD card format.

You may be able to use the card with an external USB card reader that will accept the SD card and provide a USB interface to the card.
 

jperez36

macrumors newbie
Apr 1, 2016
2
0
I purchased a new 32 GB SD card today and stuck into my laptop and cannot write to it. It says it is read-only. This is what disk util reports:
2014-03-28 21:07:49 -0500:
Name : APPLE SD Card Reader Media
Type : Disk

Partition Map Scheme : Master Boot Record
Disk Identifier : disk2
Media Name : APPLE SD Card Reader Media
Media Type : Generic
Connection Bus : USB
USB Serial Number : 000000009833
Device Tree : IODeviceTree:/PCI0@0/EHC2@6,1
Writable : No
Ejectable : Yes
Location : Internal
Total Capacity : 31.91 GB (31,914,983,424 Bytes)
Disk Number : 2
Partition Number : 0
S.M.A.R.T. Status : Not Supported


2014-03-28 21:09:13 -0500: Verifying volume “NO NAME”
2014-03-28 21:09:13 -0500: Starting verification tool:
2014-03-28 21:09:14 -0500: Checking file system
2014-03-28 21:09:14 -0500: ** /dev/disk2s1

2014-03-28 21:09:14 -0500: ** Phase 1 - Preparing FAT

2014-03-28 21:09:14 -0500: ** Phase 2 - Checking Directories

2014-03-28 21:09:14 -0500: ** Phase 3 - Checking for Orphan Clusters

2014-03-28 21:09:14 -0500: 97 files, 31151424 KiB free (973482 clusters)

2014-03-28 21:09:14 -0500: MARK FILE SYSTEM CLEAN? no

2014-03-28 21:09:14 -0500:

2014-03-28 21:09:14 -0500: ***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****

reformat the sd card in your camera after youve saved your pics. its a magic fix, worked for me.
 

SteveDavidson

macrumors newbie
Apr 30, 2016
1
1
Formatting the card fixes the card most of the times in such cases.
Even simpler: Move the lock/unlock slider to the middle position and try again. There's a flaky sensor that needs "special handling" and the midpoint seems to do the trick.
 
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