How to partition a hard drive without formatting mac

Mistakes can be made due to human error or software, either way, it is good to be safe than sorry.

Recovering lost file is expensive, time consuming and sometimes it is as good as impossible. Therefore, always backup everything in the hard drive.


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How to Partition Hard Drive without Formatting It

Disk partitioning divides a hard drive into several partitions. Partitions are usually created when the hard drive is first being prepared for use. After a hard drive is divided into partitions, an administrator or power user will be able to resize partition, move partition, split partition, merge partitions, create a new partition for Windows 7 dual boot system and so on because of later changes on the computer or the OS. So how to partition a hard drive without formatting the hard drive is very important to manage partitions for different uses. How can you partition a hard drive without formatting the device?

There are two solutions below.

Why Do You Need to Partition a Hard Drive

Windows , Windows XP or Windows Server built-in Disk Management has the ability to create a partition, delete a partition, format a partition, change drive letter and so on. If you want to re-partition a hard drive without formatting it, you need to use a third-party partition manager. Windows Vista, Windows Server or Windows 7 built-in Disk Management has the ability to shrink s volume, extend a volume, create a volume, delete a volume, format a volume and so on.

How to Erase and Partition a Hard Drive on a Mac Tutorial

If you want to extend system partition, there must be some unallocated space behind the system partition. If the unallocated space is clinging to other volumes, how to move volume and let the unallocated space be clinging to the volume which you want to extend? Windows Vista, Windows Server or Windows 7 built-in Disk Management has no "Move Partition" feature, so a third party partition manager is required. Yes you can repartition without losing data. Using Disk Utility, perform a repair on your drive to make sure the drive is free of errors even better, use Diskwarrior if you have a copy.

Then unmount your drive but don't eject it. Select the drive in the left hand pane, then go to the Partition tab.

Your Answer

Optionally you can specify the new partition size. When you're happy hit the Apply button and wait. If you've absolutely critical data on the drive make sure you have a backup which you should have anyway but I've done this many times without an issue. The reason that everyone always harps on creating a backup before running any kind of partition command is that if something goes wrong, then generally every thing is gone.


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  • I have preformed this kind of operation on PC's many times, generally it has gone well, but the two times over the years the process glitched the partition table was destroyed. Once I was able to purchase a low level sector recovery tool to get files out that way, the other I had backups and just relied on them.

    Can I create new partition without losing… - Apple Community

    If you don't have any backups, and you preform a partition re-size, and there is a problem, you better hope for either backups, or plan on paying for data recovery. Just go to disk management select the drive,which shows the external or internal HDD icon right click it then select the option shrink volume. In the new panel showing put the amount in MB you want the new partition to have.


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