12 Replies Latest reply: Mar 14, 2012 6:17 AM by noondaywitch
jodieandbrett9 Level 1 Level 1 (0 points)

1. Can someone please advise how i can transfer OR save my data or music to my external Hard Drive. As it keeps coming as my External drive is 'READ ONLY', when I have chnaged my 'Shared' setting sto Sharing.

 

2. Please help as I want to save my data to our 'Tera Byte External Hard Drive'?

 

Many thanks,


iMac (21.5-inch Mid 2011), iOS 5.1
  • 1. Re: How do I transfer my data to my external hard drive?
    Tafftech Level 2 Level 2 (265 points)

    Have you written to this drive in the past?

  • 2. Re: How do I transfer my data to my external hard drive?
    jodieandbrett9 Level 1 Level 1 (0 points)

    1. I dont understand what you mean by 'Written'?

     

    2.I read previous post of the same issue that I have.

     

    2. To go to... Applications > Utilities > Disk Utility

     

    3. But when I get to the 'Erase Tab'... I'm not sure wether to choose FORMAT as 'Mac OS Extended (Journaled) > Name: Time Machine...as I still want to use the same External Hard Drive for BOTH my Imac and my Windows Laptop. Is this still possible?

     

     

    4. OR can I use the same setting and my External Hard Drive san still be used for both Mac and Windows?

  • 3. Re: How do I transfer my data to my external hard drive?
    Tafftech Level 2 Level 2 (265 points)

    As long as it it formated MS DOS FAT it will be ok on both platforms for read/write but you will have problems with time machine as this requires Mac OS Extended (Journaled).

  • 4. Re: How do I transfer my data to my external hard drive?
    jodieandbrett9 Level 1 Level 1 (0 points)

    Thank you so much...

     

    If i choose the above option to format to MAC IS Extended ( Journaled), it means that I can only use my External Hard Drive with imac?

  • 5. Re: How do I transfer my data to my external hard drive?
    Tafftech Level 2 Level 2 (265 points)

    Windows can read but not write to Mac OS Extended (Journaled)

  • 6. Re: How do I transfer my data to my external hard drive?
    jodieandbrett9 Level 1 Level 1 (0 points)

    With 'MS DOS FAT' i can do both Read and Write?

  • 7. Re: How do I transfer my data to my external hard drive?
    Tafftech Level 2 Level 2 (265 points)

    Yes but your Time Machine will fail

  • 8. Re: How do I transfer my data to my external hard drive?
    jodieandbrett9 Level 1 Level 1 (0 points)

    It's telling me 'Couldn't Modify Partition Map'?

     

    It woun't allow me to retore my external hard drive.

     

    Why is that?

  • 9. Re: How do I transfer my data to my external hard drive?
    Tafftech Level 2 Level 2 (265 points)

    So have you decided on MS DOS FAT or Apple Partitoning? do you have any data on the drive that you need to keep?

  • 10. Re: How do I transfer my data to my external hard drive?
    noondaywitch Level 6 Level 6 (8,130 points)

    Backup the contents of the drive on the Windows PC and use the PC to Format it as FAT32. Transfer your data back to the drive and then try it on the Mac.

     

    You will not (as mentioned above) be able to use that drive for Time Machine.

     

    If you need to keep the drive for use on both platforms, any backup solution for the Mac will need another external drive formatted GUID partition map and Mac OS Extended (journalled) file system.

     

    To format the drive for Mac;

     

    Connect the external HD,

    Open Disk Utility, select your external drive in the sidebar (the top item with the makers name and serial no.). Click the partition tab. Select the partiton from the drop-down above the graphic; 1 partiton is all you need. Go to the options button and ensure that the partition scheme is GUID and the file system to Mac OS Extended (Journalled). Name the partiton (something descriptive), click Apply.

     

    When the new, named, volume appears indented to the right below the disk description, you're ready to use the drive for TM or as a clone of the internal drive.

     

    If for some reason you need to format for FAT32 on the Mac, Use MBR (Master Boot Record) as the partition map, and MSDOS as the file system.

  • 11. Re: How do I transfer my data to my external hard drive?
    jodieandbrett9 Level 1 Level 1 (0 points)

    Many thanks noondaywitch

     

    1. Why do I only need 1 Partition and not more than once?

     

    2. It actually formatted my external HD I have decided to just keep the external for MAC use only to make simple and will buy another HD for the Windows.

     

    3. Thank you for typing up all the steps...i wouldn't have known to do that. After reading the manual it still wasn't a help. I'm not so sure the meaning of PARTITION, GUID etc....For Future ref...where can I get guidance with all the terminologys and meaning to using the 'Disk Utility'?

  • 12. Re: How do I transfer my data to my external hard drive?
    noondaywitch Level 6 Level 6 (8,130 points)

    jodieandbrett9 wrote:

     

    1. Why do I only need 1 Partition and not more than once?

     

    Just a general statement for most backup conditions. There's no reason you can't have more than one and use each for a different purpose if the drive's big enough, but it complicates the backup scenario.

     

    For Time Machine use, it's best to have a drive about 2 to 3 times the size of your internal HD to ensure you'll get a long run of backups before it has to start deleting old ones.

     

    For a cloned backup, a drive or partition the same size as, or preferably a bit larger than,  the internal is all that's needed. The 'bit more than' is a protection for the long-off day when you've filled your internal HD - if it suddenly won't boot because there's no longer any swap space for the OS to use, your backup will still have extra space to allow you to boot to it and get yourself out of trouble. About 20GB or so bigger than the internal is enought to allow for that scenario.

     

    jodieandbrett9 wrote:

     

    …I'm not so sure the meaning of PARTITION, GUID etc....For Future ref...where can I get guidance with all the terminologys and meaning to using the 'Disk Utility'?

     

    I'll see if I can find a suitable reference, but for now;

     

    Partition means to divide up the drive into one or more volumes.

     

    A volume (or, sloppily, a partition) is the space you use for your data, backup clone, even another OS provided it will boot on your Mac model.

     

    GUID is the partition map used by Intel-based Macs

    APM is the partition map used by PPC-based Macs (G3, G4, G5)

    MBR is the partition map used by Windows-based computers.

     

    The file systems are;

    Mac OS Extended (Journalled) {aka HFS+ (J)} Used for OSs which use Spotlight search, and is necessary for TM

    Mac OS Extended (HFS+) without journalling is used for earlier non-Spotlight/TM versions of OS X and (if memory serves) possibly for OS9 also.

    FAT32 (designated MSDOS in Disk Utility) is an older Windows file system. Still useful as OS X can read and write to it (but not boot from it)

    exFAT (aka FAT64) is a newer file system which works on most recent Macs and Widows versions. It requires a 64-bit OS, but eliminates a problem with FAT32 where the largest file size can only be 4GB, or just under.

    NTFS is the current Windows file system. OS X can read from it, but not write to it.

     

    Here's a useful reference for TM and many other aspects of OS X, courtesy of Pondini -

    http://pondini.org/TM/Home.html  including this bit on Disk Utility.

     

    Enjoy the homework!