Main Volume blocked (read-only permissions)

Hey,
I have blocked my main volume for mistake, and now i can't unblock it.... could you please help me?
My current permissions on volume:
lrwxr-xr-x l root admin 1 Oct 12 21:05 /volumes/Mac --> /
I was trying to unblock it on my own:
sudo chflags 0 /volumes/*
sudo chmod a+rx /volumes/*
chmod: Unable to change file mode on /volumes/Mac : Read-only file system
chmod go= /volumes/*
chmod: Unable to change file mode on /volumes/Mac : Read-only file system
chmod go-w,a+x /volumes/*
chmod: Unable to change file mode on /volumes/Mac : Read-only file system
Thx in advance
- mstolarz

Ok I've just worked out that 'You can only read' is referring to the fact that I can only view permissions but not add any. Below this statement, no permissions are listed which may explain why I cannot access the files but does not explain why I can copy/access some files, also with no permissions...

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However, certain files fail to copy due to the fact that I 'don't have permission to access some of the items'...
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So can anyone suggest to me why this is? And how I might rectify the issue?
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Ok I've just worked out that 'You can only read' is referring to the fact that I can only view permissions but not add any. Below this statement, no permissions are listed which may explain why I cannot access the files but does not explain why I can copy/access some files, also with no permissions...

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Your backups may be corrupted.
See #A6 in Time Machine - Troubleshooting (or use the link in *User Tips* at the top of this forum).

I have an iMac(mid2010) running Pages v5.5.1 on OS X 10.10. Why can I not save or share documents. The error message is You can't save the file "TEST.pages" because the volume is read only.

I have an iMac(mid2010) running Pages v5.5.1 on OS X 10.10. Why can I not save or share documents. The error message is You can’t save the file “TEST.pages” because the volume is read only.
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Some of your user files (not system files) have incorrect permissions or are locked. This procedure will unlock those files and reset their ownership, permissions, and access controls to the default. If you've intentionally set special values for those attributes, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. Do so only after verifying that those settings didn't cause the problem. If none of this is meaningful to you, you don't need to worry about it, but you do need to follow the instructions below.
Back up all data before proceeding.
Step 1
If you have more than one user, and the one in question is not an administrator, then go to Step 2.
Enter the following command in the Terminal window in the same way as before (triple-click, copy, and paste):
sudo find ~ $TMPDIR.. -exec chflags -h nouchg,nouappnd,noschg,nosappnd {} + -exec chown -h $UID {} + -exec chmod +rw {} + -exec chmod -h -N {} + -type d -exec chmod -h +x {} + 2>&-
You'll be prompted for your login password, which won't be displayed when you type it. Type carefully and then press return. You may get a one-time warning to be careful. If you don’t have a login password, you’ll need to set one before you can run the command. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The command may take several minutes to run, depending on how many files you have. Wait for a new line ending in a dollar sign ($) to appear, then quit Terminal.
Step 2 (optional)
Take this step only if you have trouble with Step 1, if you prefer not to take it, or if it doesn't solve the problem.
Start up in Recovery mode. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. A Terminal window will open. In that window, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window will open. You’re not going to reset a password.
Select your startup volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button
Select
 ▹ Restart
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What to do about Backup failed with error: The target volume is read-only

This is a weird story. My wife has a PowerBook G4/1.33 GHz that she uses in clamshell mode with a 20" Cinema Display. One day under OS X 10.5.6, her Time Machine backups (to a networked 500 GB Time Capsule) failed with the error: Backup failed with error: The target volume is read-only. So I upgraded her to 10.5.7 and erased the sparseimage file, starting a new Time Machine backup. And it just happened again. Any idea how this sort of problem arises? My wife was doing something at her computer when the Time Machine error occurred.
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Pondini wrote:
odysseus wrote:
This is a weird story. My wife has a PowerBook G4/1.33 GHz that she uses in clamshell mode with a 20" Cinema Display. One day under OS X 10.5.6, her Time Machine backups (to a networked 500 GB Time Capsule) failed with the error: Backup failed with error: The target volume is read-only. So I upgraded her to 10.5.7 and erased the sparseimage file, starting a new Time Machine backup. And it just happened again.
Try repairing the sparse bundle, per #A5 of the Time Machine - Troubleshooting *User Tip,* also at the top of this forum.
I've tried this before, but it can't be repaired, because it can't be mounted.
Any idea how this sort of problem arises? My wife was doing something at her computer when the Time Machine error occurred.
One possibility is, the HD in the Time Capsule is beginning to fail (all HDs fail, sooner or later).
I'm backing up to my own sparseimage bundle just fine.
Please don't advise us to upgrade to 10.5.8, because her PowerBook freezes not infrequently with any OS later than 10.5.6, and I was just about to downgrade her from 10.5.7 to 10.5.6.
Those two things may be related. Whatever's going wrong may very well be what's corrupting the backups.
I'd recommend finding out what's wrong with the Powerbook. It's impossible to tell, of course, but that may be the root of the problem.
There's a problem with PowerBooks and Cinema Displays. I've posted a lot about this. Even after a motherboard replacement, my PowerBook G4/1.67 GHz had freezes, and eventually Apple gave me a MacBook Pro, but I think there's a failure involving hardware/software design.
If you haven't yet, I'd start by dong a +*Verify Disk+* on it's internal HD (also per #A5);
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This may fix the "read only" problem:
What to do if Time Machine reports you don't have permission
This was posted in the Apple Discussions by V.K. I have only modified it slightly to be more generic.
The problem seems to be that 10.5.6 changes permissions on a file so that even the root user doesn't have write peivileges. I have no idea why they did this. The workaround suggested in [an]other post will probably work, too, but i did something less drastic. Instead of deleting the file I changed permissions on it, and it worked just fine. An added benefit is that the permission change seems to stick, so you don't have to delete the file every time you change a drive.
[Open the Terminal application in your Utilities folder. At the prompt [enter] the following command:
sudo chmod 644 /volumes/"TM drive name"/.xxxxxxxxxxxx
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This was edited by Kappy just for cleanup.
Enable Finder to Show Invisible Files and Folders
Open the Terminal application in your Utilities folder. At the prompt enter or paste the following command line then press RETURN.
defaults write com.apple.finder AppleShowAllFiles TRUE
To turn off the display of invisible files and folders enter or paste the following command line and press RETURN.
defaults write com.apple.finder AppleShowAllFiles FALSE
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*sigh*

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Message was edited by: Norsk
null

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Can anyone help me with this? When time machine tries to run a back-up I get two errors and it fails. The first says:
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AndyPrior wrote:
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I apologize because of this post... The problem was in the file (something was wrong with the container)... so the solution was to do a new volume and copy all the files to the new file.
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using (SPSite site = new SPSite(url))
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HT3275 Any other suggestions for the message the backup volume is read only

I keep getting the message Time machine is unable to complete the backup because it appears the backup volume is read only. I've tried the suggested repairs from apple for this but keep getting the same problem. Any suggestions?

The Master of the Time Machine, Pondini has extensive documentation and he mentions your particular problem in the following link.
http://pondini.org/TM/C6.html

Main Volume blocked (read-only permissions)

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