Suddenly can't write to an external hard drive that I have been using consistently

I have been using a WD 1 terabyte external hard drive to transfer movie files between 2 MBP's and suddenly I cannot write any files to the HD. The error message is that the external hard "cannot be modified" if I try to add any files. I have tried the same hard drive on another MBP and it works fine and I can write to the hard drive (with the aid of Paragon NTFS for Mac OS). I have Paragon NTFS on my computer as well and have been able to write to the hard drive previously. I spoke to Western Digital phone support and told them the problem and noted that the icon for the hard drive is grey with a clock on my computer and is orange on the other MBP. They explained that the icon change was due to Time Machine on my computer. I currently have Time Machine turned off.
Of note, I recently upgraded my internal hard drive on my computer to a WD 500 GB internal drive. Not sure if this will make a difference. Any help would be appreciated. Thanks,

Found the issue. When I changed the internal hard drive, most softward transferred over, but not all. I had to reinstall the Paragon NTFS and I was then able to write to the external hard drive. That seemed to solve the problem.

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I have an external hard drive that I have been using for years. All of a sudden my mac will not recognize the external as a "save as" device location. But the external does show up on my desktop and I can open it to drag and drop items. Help.

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Hi,
Check Finder>Preferences>Sidebar, is it checked there to show external drives?

Why do I need to reformat and erase backups on an external backup drive that I have been using for over a year, when I get this dialog box? The backup disk is not in Mac OS Extended (Journaled) format, which is required.

The backup disk is not in Mac OS Extended (Journaled) format, which is required.

Kappy's extensive hard drive formatting post - http://discussions.apple.com/thread.jspa?messageID=8340551 - note that instructions at end are for zeroing data.
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Okay, I've sussed it. I saw a link to another discussion that hadn't turned up in any of my searches before I posted the question above.
My Tosh HDD was formatted to FAT 32 and therefore would not be backed up by Time Machine. I removed all data from it - nightmare as I hadn't enough space to put it on the macbook HDD, but, after trawling through numerous photos and deleting rubbish for hours, I finally made enough space and copied all data across. Then, after clearing the data from the Tosh HDD, I used disk utilitity to reformat it to Mackintosh OS Extended. Chose the option without kournalling because I'm not baking up onto this disk and so don't need it - according to some other discussions I found.
When it was done I check on time machine in system prefs and once I selected options, I was able to remove it from the excluded from backups list. Hey presto. Now I'm moving my photo library and my music library onto the Tosh HDD and my macbook should start to breath again. Hurray.

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More than that recently was launched SMS service, by using it you can send a SMS to any direction of the world, directly from the Provider's web site or email. It offers a Free Trial without the necessity of including the details from your credit card number.
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RingCentral is one of those internet fax service providers that deals with a lot of features, easy accessibility and wide range of services add-ons when it comes to online faxing.

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I've Googled this extensively, but I haven't had any luck finding a solution. It's really frustrating.
I recently -- after a long time putting it off -- ran all the most recent software updates. Made my computer run a lot better, but now I'm having external hard drive issues. Perhaps the updates were unrelated, but it seems awfully coincidental.
When I try to transfer any large file (I've tried with a number of .avi's), I get 'Error Code -36.' Doesn't matter which hard drive I use (a Samsung 160Gb and a 1Tb Western Digital). Both are FAT-32, so they're readable on a PS3. Is the format the issue? Does my Mac now, for some reason, not like the PC format?
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[General information on I/O error -36|http://fuzzy.wordpress.com/2006/12/10/ioerror-36>
[Error -36 reported when copying files to external drive|http://discussions.apple.com/message.jspa?messageID=8467699]
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I want to transfer most of my photos from my iPhoto library to my external hard drive. I have been getting the message that my start up disk is almost full. I want to transfer and then remove them from my computer and have them only stored externally.

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Here is some help.
https://discussions.apple.com/thread/3849933
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Edit...
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What should I do when I get an error message (error code - 8003) when I'm trying to empty the trash to clear up additional space on an external hard drive?

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tt2

I am trying to make a DVD of some of my photos in iPhoto 11. The photos are in iPhoto, but in one of my external hard drives. I have been able to make DVD's just recently, but not now. What can I do? At the end I get a notice of "failure

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When you open the finder do you see it in the Sidebar, if not then try this, make sure you are in the finder then click the finder menu then select preferences then click on the sidebar tab, make sure the external disk is checkbox is checked. Also you can click on the general tab and make sure your had the external disks checkbox checked as well. If you are still unable to read the drive if could be the format the drive is formatted as. You can try downloading Paragon NTFS for Mac this program is designed to enable the Mac to write to NTFS, most Mac can read a NTFS formatted drive.

I do not have permission to write in my external Hard Drive

Hello everybody.
I have recently bought a MacBook Pro (15, 2.16 Ghz with OS X 10.4.9) and I have a Beyond Micro 300Gb external Hard drive that I have been using with my PC. This drive has a Windows NT File System.
When I first plugged it to the Mac, I changed its name to recognize it better. Now, I am not able to transfer documents from my Mac to it, but I am able to do so through the PC.
Am I done something wrong?
Am I blocked this drive? (Once open, I see a pen crossed on the lower left corner)
And if so, Could I unblocked it to make it writable?
When I try to transfer any documents with the Mac I get a message saying that I can't do it and because I do not have permission. (I am the administrator).
I read a previous posting talking about a similar problem, but I really couldn't understand the solutions and/or differences beteween NTFS, FAT 32, MS-DOS and MacFuse (I am a complete novice).
I also tried (as suggested in the posting) to use the Disk Utility to set the permissions from there, but when I select the external Hard Drive all the options are dimmed. Also, the info panel says I only have permissions to write, having no other available alternatives to choose from.
The question is: How can I make this drive available to both Operating Systmes without erasing all the information inside (format)?
Thank You in advance.
Cordially,
Juan Carlos
MacBookPro Mac OS X (10.4.9)
MacBookPro Mac OS X (10.4.9)
MacBookPro Mac OS X (10.4.9)

Thank You rvdparis
I have just intalled MacFuse (with Tools and Core) and it does allow me now to read and write in my external Hard Drive.
Once again, THANK YOU VERY MUCH.
And yes guys, this seems to work. Forget about formatting your external hard drive. MacFuse changes the permission instantly.
Cordially,
Juan Carlos
MacBookPro Mac OS X (10.4.9)

Suddenly can't write to an external hard drive that I have been using consistently

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