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How to create, delete, and merge a partition on macOS

An incorrect rebuild usually requires reinitializing the volume and restoring the data. File Optimization should be used as part of a general disk maintenance routine for your Macintosh. Although a fragmented drive will not cause your Macintosh to malfunction, it may keep it from performing to its full potential. As files are written to and read from a volume, the file system instructs the drive mechanism where to store the file data.

It can place this information anywhere there is available free space on the volume. If there is not a contiguous free area large enough to store a file, then the file system will fragment the file. It will save pieces onto different areas of the drive. This is transparent to you. Although a file appears as one complete logical item, in most cases it is actually physically scattered around the disk in many pieces.

Fragmentation complicates the volume structures and makes the drive work harder to read the files, possibly slowing down performance. File optimization defragments the individual files on a volume. Select the volume you wish to inspect or optimize from the volume list on the left.

Click the Preview Optimization button to display the amount of file fragmentation for the selected volume. Upon completion, the size and names of all fragmented files are listed on the right side of the stage, as well as the total number of fragmented files. Click on a file name from the list to show the full path to the file or click the Show button to open a Finder window with the file selected in it. Click the Run File Optimization button to defragment any fragmented files on the selected volume.

Progress is displayed on the stage during defragmentation. Optimizing a corrupted volume would most likely spread the corruption as file fragments are moved around on the hard disk. File Optimization is fairly time consuming. It may take several hours to complete you might want to start it at the end of the day and let it run overnight.

You can stop the process if you wish by clicking the Stop button on the lower right side of the stage.

How to maintain your Mac's storage

When you click this button, TechTool Pro will finish defragmenting any files it is working on and gracefully stop the process. An unexpected quit during optimization could cause file corruption. To fully optimize a volume by defragmenting all individual files and consolidating the free space, run Volume Optimization.

Volume Optimization should be used as part of a general disk maintenance routine for your Macintosh. As files are written to a volume, they may be scattered around on the hard drive. This fragments the free space on the hard drive. The Macintosh file system sometimes needs to allocate large contiguous blocks of free space for certain operations, such as for swap space. If it cannot do this, system performance may suffer. Volume Optimization displays a graphical representation of the free and used space and also optimizes the volume by consolidating the free space on it.

Click the Preview Optimization button to display information about the volume and a graph of the volume space usage on the stage. Click the Run Volume Optimization button to perform a volume optimization of the selected volume. Progress is displayed on the stage as the free space is defragmented. The stage displays a dynamic bar graph showing the distribution of data and free space on the drive. The higher the bar, the more data is stored in that area of the drive.

As the optimization progresses, the area of the volume currently being optimized will be displayed in flashing yellow in the bar graph. The goal of volume optimization is to move all data to the beginning of the drive and all the free space to the end. NOTE To optimize a volume, it must be unmounted. This means that you cannot optimize the current startup volume. To optimize the normal startup volume you must boot the computer and run the program from another location, such as an eDrive. Volume Optimization is fairly time consuming.

When you click this button, TechTool Pro will finish relocating any files it is working on and gracefully stop the process. An unexpected quit during optimization could cause serious directory corruption. In this case, you can use the Volume Cloning tool to optimize the volume, described below. TechTool Pro offers the ability to create either a duplicate clone of an entire disk, or a file sync clone that copies every file on a disk to a backup drive, and then syncs changed files for subsequent clones. A duplicate clone offers the possibility but not a guarantee that files lost on the original volume may be recoverable from the clone.

Disk Image cloning saves the clone to a file. This is advan- tageous if another drive is not available. The resulting drive can also be bootable. The advantage of cloning to a disk image is that you do not need to have an external hard drive or partition available, only enough free space on your hard drive. You can then copy the image to another device when that device becomes available, or make copies of the disk image to multiple locations.

To create a Duplicate clone, select Duplicate Cloning from the drop-down menu. Only disks or partitions larger than the source partition will be available as a destination for the clone. Checking 'Verify destination copy' performs a verification on the destination volume after the copy to ensure a proper duplication from the source volume.

Checking 'Restore destination name' restores the destination volume to its original name. Otherwise, the name of the source volume will be used. All files on the destina- tion volume will be lost.

File Sync Cloning is also available. By choosing File Sync Cloning, the destination volume does not need to be erased. Subsequent clones will only copy files that are new or have changed since the last sync. Choosing 'Skip newer destination files' ignores newer files on the destination volume.

How to create, delete, and merge a partition on macOS

Files on the destination volume that have changed since last sync will not be replaced. If only the file size differs, the destination file will be replaced. Choosing 'Enable destination ownership' copies owner and group permission settings from the source volume to the destination volume. This allows the volume to be bootable after sync. Otherwise, the owner and group settings of the current user and group will be used. WARNING Be sure to verify that the volume you are using as the destination for the clone does not contain any files before you erase it.

All files on the destination volume will be lost. If the Volume Optimization tool reports that the directory of a volume is too fragmented to optimize, you can achieve the same effect using the Volume Cloning tool and an empty partition on an available drive that is large enough to contain all of the data on the volume to be optimized. Begin by creating an empty partition that is the same size or slightly smaller than the source drive using a program such as Disk Utility. Next, set the Volume Cloning tool to use the File Sync Clone method, with the volume to be optimized as the source and the new partition as the destination.

Click Clone to Volume This process optimizes the data as it is copied. After cloning is complete, verify the clone by holding 'option' at startup and verify that the clone starts up the Mac as expected. Then, start up from an eDrive to complete the process.

Free space redistribution among Mac partitions

After starting up from the eDrive, return to the Cloning tool, this time selecting the Duplicate Cloning method. Reverse the source and destination, setting the clone as the source and your original hard drive as the destination. To create a disk image clone, choose the source, the type of disk image. Clicking Clone to Volume TechTool Pro will then copy the contents of the target drive to a. Double-clicking the resulting. You should only try to recover personal data that is not already backed up. Don't try to recover application or system files, since such files typically don't operate properly by themselves.

These files should be restored from their original source. Directory Backup files are backups of a volume's directories. They contain important file location data, allowing TechTool Pro to easily find files that haven't already been overwritten. The Trash History is a record of the location of deleted files. This information allows TechTool Pro to recover a deleted file, again assuming it hasn't already been overwritten.

We strongly suggest enabling these features since they dramatically increase the chance of successful data recovery. However, even if the Protection features were not enabled prior to a problem, TechTool Pro may still be able to recover files from a corrupted drive by scanning the entire drive for directory data. To display the Data Recovery Protection configuration window, choose Data Recovery from the Tools category and then click the Protection tab.

The left side of the configuration window shows the Directory Backups list.

Each recognized volume along with its associated Directory Backup files indented beneath the volume name is listed here. The Directory Backup files are identified by the date and time they were created. Typically, you would select the most recent available Directory Backup file since it will most accurately represent the state of the volume contents.

TechTool Protection saves a maximum of three Directory Backup files for each volume, deleting the oldest one when necessary to save a new one. NOTE If a volume is badly corrupted, it is possible that the Directory Backup files cannot be read on it and it will not show up in this section of Data Recovery. In that case, try scavenging the entire hard drive in the Drives section.

Consequently they are not a completely accurate map of the location of files and folders on a volume. If a file has been moved or overwritten since the Directory Backup file was made, this will not be reflected in the Directory Backup file. In that case the recovered file will be corrupt. Be sure to open or check recovered files to be sure they are valid. It will be slower since the entire hard drive not just an individual volume must be scanned for directory information. The left side of the configuration window shows the Drives list. Each recognized drive is listed here.

Once you have selected a drive or volume from which to recover data, enter the search options on the right side of the configuration window. Enter a search string in the "Folder or file name to locate" field the search is not case sensitive.

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If shrinking still fails then: Try the Ultradefrag at boot time Note you have to install the normal version, as you cannot enable boot time defragmentation from the portable version: [ WayBack ] UltraDefrag Handbook: Graphical Interface — 7. Rate this:. Share this:.

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Like this: Like Loading Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:. Email required Address never made public. Name required. Post to Cancel. Browse Search. Ask a question. Question: Q: Question: Q: Not enough space to consolidate I'm trying to consolidate my itunes library, which is all over the place after years of migrations and external drives and back-ups and then save one master copy. Thanks for any help and pointers you might give. More Less. Reply I have this question too I have this question too Me too Me too.

Question marked as Apple recommended User profile for user: Limnos Limnos. Mac OS X Speciality level out of ten: 1. Answer: A: Answer: A: Consolidate copies files, it does not move them.