Lot of Mac OS X users reported this issue in Apple support communities. External hard drive showing up in Disk utility not in Devices. This problem also happened after OS X Yosemite update. Solution 1:-Go to Settings - Finder Preferences. Under the General tab, select External drive in “Show these items on the desktop”. Formatting a drive will erase all data and partitions on the disk: Connect the hard drive or USB key to the Mac.
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What is the best file system for USB or external hard drive on Mac?Windows and Mac OS X use different file systems. Windows uses NTFS and Mac can't write files to volumes with NTFS format.So, if you want to use a USB flash drive or an external hard drive with NTFS format on Mac, you should first reformat the devices to the Mac OS Extended file system.
It is the best way to ensure full Mac compatibility of a new external hard drive or flash disk.Usually, FAT32 which can be read and wrote on Mac is recommended for maximum compatibility. And if you need to transfer files larger than 4 GB between Macs and Windows computers, exFAT or MS-DOS (FAT) is better. How to format USB flash drive or external hard drive for MacBut how can you format USB flash drive or external hard drive for Mac?
This page will show you two ways to do this job:Format USB or external hard drive for Mac using Mac disk utilityFormat USB or external hard drive for Mac on Windows PC using third-partyNow, you can follow these two solutions to format any hard drive, flash drive, USB drive, SSD or any other external storage drive so as to make them work on your Mac now. Format USB or external hard drive for Mac using Mac Disk utilityWindows offers users built-in disk management tool to create, delete, resize, merge and format partitions. You can try the following steps to format USB or external hard drive for Mac with Disk Utility on Mac.
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1. Connect the USB or external hard drive to your Mac computer. 2.
Launch the Disk Utility by clicking 'Applications' 'Utilities'. 3. Locate and click on your USB or external hard drive in Disk Utility and then click on 'Erase'. 4. Next to 'Format', click the contextual menu and select 'Mac OS Extended (Journaled)'. 5. Reset the drive name and click 'Erase', confirm the operation on the next pop-up window. Wait for the process to complete and then you'll get compatible HFS+ file system on your external hard drive or USB, which will make your device compatible and workable on your Mac.Method 2.
Format USB or external hard drive for Mac using third-party USB format tool on a Windows PCIf you need a simpler format tool to format USB or external hard drive to FAT32 to make them work on Mac, you can apply a third-party format tool to format them on Windows PC. EaseUS is a popular disk partition management tool which is available for all hard disk related jobs such as format disk partition, extend system partition, settle low disk space problem.Now you can try it to format USB or external hard drive on your Windows PC by following the steps below. If you stored important data on the USB or external hard drive, you can try this tool to without formatting. Why Choose EaseUS Partition Master?' I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions.'
—'Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available.' —'I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes.' — Will the 'Migrate OS' feature transfer the Windows system files only or the whole C drive?To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C. Does EaseUS Partition Master license apply to multiple computers?The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines. What is the difference between EaseUS Partition Master Trial version and the Free version?Free is for home users only, with most basic functions available such as partition resize and clone.
While trial can help you understand how this product works and test what a full license can do on a business or server OS machine. Will it cause any data loss after resizing the partition in EaseUS Partition Master?Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.
What should I prepare before resizing the partition?On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.
. Don’t Erase Data — This method is quick, but not secure. It removes the volume's catalog directory but leaves the actual data intact. Zero Out Data — This method provides a good level of security. It erases the volume's data by writing over it with zeros. The length of time this method takes depends on the size of the volume. 7-Pass Erase — This method meets the security requirements of the standards for erasing magnetic media.
This erase method can take a long time. 35-Pass Erase — This is the highest level of data erase security that Disk Utility supports. It writes over the data on a volume 35 times. Don't expect this erase method to finish any time soon. Fastest — This is the quickest erase method. It doesn't scramble the file data, which means a recovery app may be able to resurrect the erased data.
Zero Out the Data — This erase method writes a single path of zeros to all locations on the selected volume or disk. Advanced recovery techniques could restore the data, but it would require a great deal of time and effort. Three-Pass — This is a DOE-compliant three-pass secure erase.
It writes two passes of random data to the volume or disk and then writes a single pass of a known data pattern to the volume or disk. Most Secure — This method of securely erasing a volume or disk meets the requirements of the U.S. Department of Defense (DOD) 5220-22M standard for securely erasing magnetic media. The erased volume is written to seven times to ensure the data can't be restored. Select a drive from the list of drives and volumes shown in Disk Utility. Each drive in the list displays its capacity, manufacturer, and product name, such as 232.9 GB WDC WD2500JS-40NGB2.
Click the Erase tab. Enter a name for the drive. The default name is Untitled. The drive's name eventually, so it's a good idea to choose something that's descriptive, or at least more interesting than 'Untitled.'
. Select a volume format to use. The Volume Format drop-down menu lists the available drive formats that the Mac supports.
Select Mac OS Extended (Journaled). Click Security Options to open a menu that displays multiple secure erase options. Optionally, select Zero Out Data. This option is for hard drives only and should not be used with SSDs.
Zero Out Data performs a test on the hard drive as it writes zeros to the drive's platters. During the test, Disk Utility maps out any bad sections it finds on the drive's platters so they can't be used. You won't be able to store any important data on a questionable section of the hard drive. The erase process can take a fair amount of time, depending on the drive's capacity. Make your selection and click OK to close the Security Options menu. Click the Erase button.
Disk Utility will unmount the volume from the desktop, erase it, and then remount it on the desktop.
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