How do I change the "Permissions" on an external drive to 'read & write'?

I am experiencing a problem with an external Hard Drive that I'm now using with my iMac, that used to be connected to my old PC.
I can't write anything to it. When I check its "Info", under the "Sharing and Permissions" tab, it says "You can only read".
Does anyone know how to change this so that I can both read and write to the drive like normal?

Hello br121
You will need to *Partition and Format* the External Hard Drive.
+Warning save all the data to another drive, partitioning and formatting will erase your drive.+
If you want to setup the drive exclusively to use with the iMac (Time Machine, Cloning your Mac HD or storing large files) you will have to reset the partition map scheme to *GUID Partition Table* and format to *Mac OS Extended (Journaled).*
If you want to setup the drive so that both Mac and windoz systems can read and write to it, then you will want to reset the partition map scheme to MS-DOS and format to FAT-32
+(keeping in mind that FAT-32 has a single file size limit of 4GB)+
The following article by Ken Stone was written before Snow Leopard, but it's still very helpful because basic Disk Utility partitioning and formatting is the same.
http://www.kenstone.net/fcphomepage/partitioningtiger.html
If you get stuck you can refer to Ken's article above, Disk Utility HELP and or come back here.
Dennis

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Hi
How do I change "Sharing & Persissions" on an external drive. The drive has a note "You can only read". My account is "read and write" > Fetching is "read and write" and > Everyone is "read only". I want to change Everyone to "read and write".
Thank you
VPH

Try this:
That is if you wnat to open it to everyone.
OT

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when I check the sharing and permissions tab it says: “You can only read”
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Message was edited by: xnav

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How do I change the "Permissions" on an external drive to 'read & write'?

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