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Helpful answers
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Mar 15, 2016 7:28 PM in response to adhoddeby gail from maine,You have a terrabyte of space on your Windows hard drive?
GB
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Mar 15, 2016 7:31 PM in response to adhoddeby MasterofApple,If you can't back it up to your computer, back it up to iCloud.
- Connect your device to a Wi-Fi network.
- In iOS 8 or later, tap Settings > iCloud > Backup.
In iOS 7 or earlier, tap Settings > iCloud > Storage & Backup. - Make sure that iCloud Backup is turned on.
- Tap Back Up Now. Stay connected to your Wi-Fi network until the process completes.
- Make sure the backup finished by tapping Settings > iCloud > Storage > Manage Storage, and then select your device. The backup you just made should appear in the details with the time and backup size.
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Mar 15, 2016 7:33 PM in response to gail from maineby adhodde,yes I have a 2 terabyte hard drive and have only used about 400 gigabytes.
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Mar 15, 2016 7:37 PM in response to adhoddeby gail from maine,What version of iTunes and Windows are your currently running?
And, sorry, just to be clear, this is a 2TB internal hard drive, correct? (sorry - just want to make sure)
Cheers,
GB
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Mar 16, 2016 8:29 AM in response to gail from maineby adhodde,Yes it is an internal HD, using Windows 7 Pro, and iTunes 12.3.2.35 64 bit.
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Mar 16, 2016 8:36 AM in response to adhoddeby javaliga,Just to be clear, are you SURE you are backing up to iTunes and not iCloud?
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Mar 16, 2016 8:58 AM in response to adhoddeby turingtest2,Tying things down even further, is the 2Tb drive the system drive, or a data drive where you have installed your iTunes library? Regardless of where the library is, iOS backups will normally go to the system drive. If using a fast, but small, SSD drive for the boot volume this could be at the root of the problem. See Relocate iOS device backups for a possible workaround.
If it isn't that then I believe there is an obscure file system bug in Windows that can occur with certain calls to check on free space where only the low order bits of the value are returned. Imagine if the free space was 1,000,001 bytes but the routine requesting the information gets back the value 000,001. If that is what is going on then finding some large file and making a few redundant copies of it may be sufficient to work around the problem.
tt2
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Mar 16, 2016 2:37 PM in response to turingtest2by adhodde,I do have multiple hard drives the main hard drive C:\ is 1.8 TB with 1.3 TB free, the K:\is a 1.8 TB drive that I use for system backups.
I have iTunes set to local backup.
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Mar 16, 2016 2:46 PM in response to adhoddeby turingtest2,Is there an existing backup? If there is, but it is corrupt, then it is just possible iTunes is issuing an error message, just not the most appropriate or descriptive one. With iTunes closed you could try moving the current backup folder (long random string of characters) out of the %AppData%\Apple Computer\MobileSync\Backup folder which would force iTunes to make a new one. It may also help to reboot both computer and device before trying again.
tt2