Now while on the PC you may wish to consider reformatting that partition using ExFAT (if supported on your PC.) This format is more compatible with both OS X and NTSF supporting long file names and other FAT filesystem irregularities. When you connect the drive to your PC it should have no problem reading the partition set up for a PC. The one you wish to use on a PC you should format MSDOS (FAT).

Re-partition the drive to create the three partitions. The format process can take up to several hours depending upon the drive size.ħ. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.Ħ.

Name: ADATA HC660 Format: Mac OS Extended (Journaled) Schem v GUID Partition Map Disk disk2 se Capacity: Child count: Type: Device: Security O Location: Connection: Partition Map: S.M.A.R.T. The steps here are using Mac OS X 10.6.7 and should be similar for. partition map and format, and click Erase to proceed. A malfunctioning USB port on your Mac could be the source of your connectivity problems. This tutorial goes through the steps of partitioning an empty external hard drive using Disk Utility, which comes with every Mac. Its possible that reconnecting the external hard disc will solve the problem. Click on the Erase tab in the DU main window.ĥ. One of the reasons your Mac wont let you erase files from your external hard drive is connection troubles. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.Ĥ. Click on the Options button, set the partition scheme to GUID then click on the OK button. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Partition tab in the DU main window.ģ. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Back up the data on it at first to avoid data loss. Open Disk Utility in your Utilities folder.Ģ. If you think the partition on the external hard drive is unreasonable and just want to repartition the external hard drive, you can use Windows Disk Management to extend partition or shrink partition, delete or create partition.

Erase partition external hard drive mac