Can i repartition an extended hard drive?

I partitioned a 1TB Seagate exHD so i could back up with Time Machine and use the partition for other stuff.Well, i never used the other side but, now the partition i used for TM is filled. So, what i want to know is whether i can repartition the unused side and use part of that for my new TM backups?I have a Mac air,version 10.10

Open the Disk Utility, select the drive, and look at the Partition tab.
If the Time Machine backup is on the first partition in the list, delete the second, drag the slider below the first as far down as it will go, and click Apply.
If the Time Machine backup is on the second partition in the list, move it to the first or another location, delete the second, put it onto the first if needed, and proceed as above.
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Extended Hardware Test - can this miss a dead hard drive?

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I am having all kinds of problems with my computer since installing a recommended update last week. I cannot fully restart it, cannot make repairs with disk utility, and cannot reinstall OS X to the harddrive volume because it doesn't list any available volumes. My hardware profile, as listed in the Hardware Test utitily, is as follows:
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How can I use my external hard drive on both pc and mac, but also being able to use it to back up my mac data?

I want to be able to transfer some of my files from my laptop to my macbook, but not all of them. I have a NTFS external hard drive and I have heard about reformatting it so that it can read/write across both systems, but can I still use this hard drive to back up the data on my macbook? If I can, how should I go about reformatting the hard drive?

FORMAT TYPES
FAT32 (File Allocation Table)
Read/Write FAT32 from both native Windows and native Mac OS X.
Maximum file size: 4GB.
Maximum volume size: 2TB
You can use this format if you share the drive between Mac OS X and Windows computers and have no files larger than 4GB.
NTFS (Windows NT File System)
Read/Write NTFS from native Windows.
Read only NTFS from native Mac OS X
To Read/Write/Format NTFS from Mac OS X, here are some alternatives:
For Mac OS X 10.4 or later (32 or 64-bit), install Paragon (approx $20) (Best Choice for Lion)
Native NTFS support can be enabled in Snow Leopard and Lion, but is not advisable, due to instability.
AirPort Extreme (802.11n) and Time Capsule do not support NTFS
Maximum file size: 16 TB
Maximum volume size: 256TB
You can use this format if you routinely share a drive with multiple Windows systems.
HFS+ ((((MAC FORMAT)))) (Hierarchical File System, a.k.a. Mac OS Extended (Journaled) Don't use case-sensitive)
Read/Write HFS+ from native Mac OS X
Required for Time Machine or Carbon Copy Cloner or SuperDuper! backups of Mac internal hard drive.
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Maximum file size: 8EiB
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EXFAT (FAT64)
Supported in Mac OS X only in 10.6.5 or later.
Not all Windows versions support exFAT.
exFAT (Extended File Allocation Table)
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Maximum volume size: 64 ZiB
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i don't know if this question has been asked before: how can I use my external hard drive for my iphoto instead of my mac book pro memory? just like itunes all my song are save on my external hard drive. make sense?

Moving the iPhoto library is safe and simple - quit iPhoto and drag the iPhoto library intact as a single entity to the external drive - depress the option key and launch iPhoto using the "select library" option to point to the new location on the external drive - fully test it and then trash the old library on the internal drive (test one more time prior to emptying the trash)
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Try this first:
Extended Hard Drive Preparation
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I have a Seagate 1TB portable hard drive, connected by USB to my MacBook Pro.
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In Disk Utility select that external drive then click the Partition tab. Then select One partition from the Partition Layout drop down and make sure it is set to a GUID partition table, that is under the Options button, and the format is set to Mac OS Extended (Journaled).
Then Click the Apply Button. If the drive is still good it will be partitions and formatted and then can be used for a TM backup drive.
But I suspect either the drive is failing or the electronics in the drive enclosure are failing. In the first case there isn't much you can do about a failing hard drive except replace it. On the second part if the enclosure electronics are failing then you can take the physical hard drive out that enclosure and connect it to your mac with a SATA to USB adapter or put it in another enclosure.
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Have you tried Trashing the iMovie preferences file and re-launching?
Geoff,

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OK. Start with:
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
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Honey_Revenge wrote:
Thanks.
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Can i repartition an extended hard drive?

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