External Hard drive is suddenly Read only.  Help!

I reformatted my I mac due to it being extremely slow. After reformat, the toshiba external hard drive that I have been using for months before with no problem, is now a read only. I have over 1TB of space available and I need to use it. Does anyone know what happened and how to fix it. I cant lose my information.

In the Finder, press the key combination shift-command-C, or select
Go ▹ Computer
from the menu bar. A window will open showing all mounted volumes. Select the one in question and open the Info window. What is shown as the Format in the General section?

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    Hi Kappy,
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  • My external hard drive change to read only

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    Disd you ever get a resolution to your problem? I have exactly the same problem with my ADATA HD710 I use for Time Machine, it works fine for a while, then for no apparant reason I can no longer write to the disc. Even though my permission is still read/write, I am told I can only read and everything is greyed out in disk utility. Previously fixed problem by reformatting, and starting again, but have just lost ability to write again. Need help!
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    I have an external hard drive I've been using on Windows XP for the longest time. I never set any permission settings on it, and I even made it a freely shared network drive on XP. Any other Windows computer I plug the drive into, I can freely read and write. I can't write to it in Mac. I used to not even be able to view the drive at all under Tiger, but now in Leopard I can read but I can't write.
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    Hi i have same problem but quite different.. if anybody knows the resoultion please help me out.. i have 250 gb external harddisk drive was using for my perosnal in my mac book and i use for windows also. suddently i don't what's wrong with my mac.. today morning i connect to my mac book it shows the external drive is read only file system. i cann't able to write the data on it.But if i connect to some other macbook it works perfectly.. i did check for other external harddisk drive and pen drive . only in my mac it shows read. only.. please help me out this issue..

  • External hard drives appear as read only.....

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    I have the same problem. I'm using a SimpleTech SimpleDrive Deluxe (via firewire), formatted by PC running Windows XP. I just checked "Get Info" and drive is indeed formatted with NTFS. So ... would this solution work:
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    Regards
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    This question was solved.
    View Solution.

    Search the Internet and found many others with external drives, Vista, and this issue.
    Found this fix (fix?):
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    ... an HP employee expressing his own opinion.
    Please post rather than send me a Message. It's good for the community and I might not be able to get back quickly. - Thank you.

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    The drive has malfunctioned and corrupted itself. If that has ever happened before, or if it ever happens again, replace the drive. You may want to consider replacing it anyway for the safety of your data.
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    to frederic1943
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