Generally, on Mac systems EFI partition is left blank and unused for booting. But some unfavorable conditions arise and damage EFI partition thus resulting in improper booting of Mac OS X EI captain. A problem in Mac OS X EI captain hard drive partition is confirmed by booting into recovery mode then running disk utility from second hard drive. Mac iBook (G3 500Mhz Processor) 256 MB Ram Operating System OS X Panther 10.3 Additional Set-up Notes My iBook is one of the last series of Apple Macintosh marques that allows a dual boot by pressing (ALT on a restart) and I have the CLASSIC OS 9.1 OS installed on another partition. Things to bear in mind.
Disk Utility User Guide
Mac Os Partition Software
Partitioning a disk divides it into individual sections, each of which acts as a separate volume.
However, with APFS, you shouldn’t partition your disk in most cases. Instead, create multiple APFS volumes within a single partition. With the flexible space management provided by APFS, you can even install another version of macOS on an APFS volume.
Important: If you’re partitioning your internal physical disk because you want to install Windows, use Boot Camp Assistant instead. Do not use Disk Utility to remove a partition that was created using Boot Camp Assistant. Instead, use Boot Camp Assistant to remove the partition from your Mac.
Add a partition
Important: As a precaution, it’s best to back up your data before creating new partitions on your device.
In the Disk Utility app on your Mac, select a volume in the sidebar, click the Partition button , then click Partition.
Internal storage devices appear below the Internal section in the sidebar. External devices appear below the External section in the sidebar.
When you select a volume that already has data on it, the pie chart shows a shaded area representing the amount of data on the volume and an unshaded area representing the amount of free space available for another volume. Disk Utility also shows whether the volume can be removed or resized.
Note: If you see a small volume with an asterisk, the partition is smaller than can be represented at the correct scale in the chart.
Click the Add button .
Type a name for the volume in the Name field.
For MS-DOS (FAT) and ExFAT volumes, the maximum length for the volume name is 11 characters.
Click the Format pop-up menu, then choose a file system format.
Enter the size or drag the resize control to increase or decrease the size of the volume.
Click Apply, click Partition, then click Continue.
Click Show Details to view the step-by-step process of creating a new volume.
After the volumes are created, click Done.
After you partition a storage device, an icon for each volume appears in both the Disk Utility sidebar and the Finder sidebar.
Mac Os Partition Vs Volume
Delete a partition
WARNING: When you delete a volume or partition, all the data on it is erased. Be sure to back up your data before you begin.
In the Disk Utility app on your Mac, select a volume in the sidebar, click the Partition button , then click Partition.
In the pie chart, click the partition you want to delete, then click the Delete button .
If the Delete button is dimmed, you can’t delete the selected partition.
Click Apply, then click Partition.
After the volume is deleted, click Done.
Erase a partition
In the Disk Utility app on your Mac, select the volume you want to erase in the sidebar.
Click the Erase button , then click Erase.
If the Erase button is dimmed, you can’t erase the selected volume.
After the volume is erased, click Done.
Enlarge a partition on a storage device
If you have multiple partitions on a device and one of them is running out of space, you may be able to enlarge it without losing any of the files on it.
To enlarge a volume, you must delete the volume that comes after it on the device, then move the end point of the volume you want to enlarge into the freed space. You can’t enlarge the last volume on a device.
WARNING: When you delete a volume or partition, all the data on it is erased. Be sure to back up your data before you begin.
In the Disk Utility app on your Mac, select a volume in the sidebar, then click the Partition button .
In the pie chart, select the partition you want to delete, then click the Delete button .
Click Apply.
The partition is removed, reformatted, and all free space is assigned to the previous partition.
Click Done.
How To Fix A Broken EFI Partition On Mac OS X El Capitan
It is seriously an unfortunate occurrence, when Mac OS X EI Captain suffer broken or damaged EFI partition which typically prevents Mac's booting and Mac OS system software from loading. Therefore, to deal with this situation, some helping tips are given below. Read it carefully!!
What Is EFI partition?
EFI stands for Extensive Firmware Interface is primarily intended for IA-32 and Itanium architecture based computers. EFI specification provides a model for interface between operating system and platform firmware. An EFI partition is a partition on data storage device either on a hard disk drive or solid state drive used by computers. When a computer is booted, UEFI (Unified Extensible Firmware Interface) loads files stored on EFI partition to start installed operating system and other various utilities.
Generally, on Mac systems EFI partition is left blank and unused for booting. But some unfavorable conditions arise and damage EFI partition thus resulting in improper booting of Mac OS X EI captain. A problem in Mac OS X EI captain hard drive partition is confirmed by booting into recovery mode then running disk utility from second hard drive.
Reasons For Broken EFI Partition
Mac OS X EI captain considered to be the powerful operating system. Despite, you may come across problem like broken or damage EFI partition. Several factors can badly affect this partition. The factors may include power cut, bad sectors on hard drive, any virus attack, software or hardware issues, automatic corruption of partitions and many other factors. All this results in breaking or damage of EFI partitions. Thus, you need to repair this quickly.
Fix A Broken EFI Partition On Mac OS X El Capitan
Since a broken EFI partition prevents Mac OS from starting up properly, it is a little challenge for you to repair. If you are wrangling with this problem so first thing you should try is to reinstall Mac OS X EI captain onto your computer. However, reinstalling Mac OS is just not enough to troubleshoot that problem. Hence, you need help of a software called Stellar partition Manager which is a fast and most secure method to fix broken EFI partition in order to boot the OS again. This will help you in dealing with all kinds of disk partition related operations.