Hard drive "Read only"

Hey guys,
I am new to Mac. My hard drive has been working fine until recently it changed to "read only" mode. I tried to follow the steps form other discussion - verifying disk. When i clicked "verifying disk" , it came up as "verifying volume failed: Invalid request" and all ther options are greyed out.
could any of you help me out with this. I got important files in this hard drive . I am running Mac OS X version 10.7.4
Thanks heaps

Tuscania wrote:
I completely agree with you. I really don't mean to sound like an idiot or disregard what you're saying. I'm obviously missing something, but I just don't see how that's possible because I used it last week without a problem. I can't have accidentally reformatted it because all of my data is still there. It would have been erased if I had. On top of that, the process of reformatting a hard drive is a little too difficult to do accidentally. So while I agree with what you're saying, how can it be possible when I used it just last week?
Is it possible that it's partitioned? Or that you thought it was saved and it didn't (which would be nearly impossible to miss with all the things a Mac does). You don't sound like an idiot or anything. We are missing something, but there is just no way to write to an NTFS drive, unless you've got some software that helps you do that. Does someone else have access to the drive? They thought they were helping you out by saying "what person has their Windows drive still in FAT. I'll help out my buddy Tuscania and reformat it."

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Time Machine - External Hard Drive Read only error

Just recently got a Iomega 1TB MiniMax FireWire 800 USB 2.0 Desktop Hard Drive and used Time Machine to backup my computer. This was my first time using Time Machine and it successfully backed up 350 GBs. It continued to do backups every hour. When I turned my computer off and then turned it on the next day Time Machine wouldn't allow me to do a backup because it said the hard drive was read only. When I checked info it said it was read/write. I used disc utility to verify disc it said it could not verify disc do a disc repair. Disc repair failed and it said reformat disc. I erased the hard drive tried again and I got the same error message. The hard drive is formatted Mac OS Extended (Journaled). I searched this forum and the trouble shooting links and couldn't find anything on how to correct this. Any help on this problem would be appreciated.

See the following:
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
The name of the file .xxxxxxxxxxxx is based on the MAC address of your computer and will be different for every computer. Put the name of the TM drive in the above and keep the quotes.
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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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Message was edited by: Kappy

Why is external hard drive read-only on one Mac, but read/write on another?

I have a Seagate Backup Plus Portable Drive. I bought it to be compatible with both Windows and Mac, which it currently is. It works just fine on my PC and my MacBook. However, recently, I bought a MacBook Pro. The Seagate drive shows up as read only on the MacBook Pro, though it is read/write on my MacBook. It's formatted NTFS, yes, but it already works on my MacBook. What's going on here?

Nope, one of the selling points of the drive was that it came ready to work with both Mac and Windows (the product description says there is an NTFS drive installed for use on Mac). No hacking or installing on my part.
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See Pondini's TM FAQs, for details.

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http://www.cnet.com/au/news/how-to-manually-enable-ntfs-read-and-write-in-os-x/
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Hi
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External Hard Drive Read Only. Please Help!

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My guess would be it has created an entirely new backup of your drive when you upgraded to Mavericks.
See Here: http://pondini.org/TM/1.html
And here: http://pondini.org/TM/9.html
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Last edited by JJ.Eastwood (2011-05-26 19:50:56)

Hard drive "Read only"

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