DrJava is a lightweight development environment for writing Java programs. It is designed primarily for students, providing an intuitive interface and the ability to interactively evaluate Java code. Apr 10, 2018  The Mac Pro is designed to have its hard drive replaced easily, while an iMac requires you to remove the entire screen. If you’re not sure you have the technical chops to do it right, you should consider asking a more qualified friend to help, or even going to the professionals.

Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.

How to erase a disk

Proceed based on whether you're erasing your startup disk or some other disk. Your startup disk is the disk (volume) that your Mac started up from. By default it's the disk built into your Mac, named Macintosh HD. If you're selling, giving away, or trading in your Mac, you should erase your startup disk.

Erase a startup disk

1. Start up from macOS Recovery.
2. Select Disk Utility from the Utilities window in macOS Recovery. Then click Continue.
   
3. Make sure that the sidebar in Disk Utility shows the name of your startup disk. The volume representing your startup disk is Macintosh HD, unless you renamed it. Don't see it?
   
4. Look for a ”Data” volume with the same name, such as ”Macintosh HD - Data.” If you have such a volume, select it. Then choose Edit > Delete APFS Volume from the menu bar, or click the delete volume button (–) in the Disk Utility toolbar.
   When you're asked to confirm, click the Delete button. Do not click Delete Volume Group. Do the same to delete other volumes you might have on your startup disk—except the volume named Macintosh HD.
5. After deleting any Data volumes, select Macintosh HD in the sidebar.
6. Click the Erase button or tab, then complete these items:
   • Name: Enter a name that you want the volume to have after you erase it, such as Macintosh HD.
   • Format: Choose either APFS or Mac OS Extended (Journaled) to format as a Mac volume. Disk Utility shows the recommended Mac format by default.
7. Click Erase to begin erasing. You might be prompted to enter your Apple ID.
   
8. When done, quit Disk Utility to return to the Utilities window.
9. If you want your Mac to be able to start up from this volume again, choose Reinstall macOS from the Utilities window, then follow the onscreen instructions to reinstall macOS on the volume. If you don't reinstall macOS, your Mac might start up to a flashing question mark (?).

Erase some other disk

The steps above also work when erasing a storage device that you're not using as a startup disk. However, in that case it's not necessary to open Disk Utility from macOS Recovery: you can instead open it from the Utilities folder of your Applications folder. And you don't need to delete data volumes first: just select your disk in Disk Utility, then click Erase.

You may want to do this, for example, if you want to create a contact group. Mac outlook on my computer backup. To find out what type of account you have.On the Tools menu, click Accounts.In the left pane of the Accounts dialog box, click the account. The account type appears under the account description. Showing the On My Computer folders is required to create a contact group because the group does not sync with the Exchange server.

How to change the partition map (scheme) of a disk

In some circumstances, you might need to change the partition map (scheme) while erasing. If you're following instructions that require choosing a scheme, the steps in Disk Utility differ from the steps above.

1. After opening Disk Utility, choose View > Show All Devices from the menu bar.
2. The sidebar now shows not just volumes, but also the disks (devices) that contain those volumes. In the following example, APPLE SSD is the disk, Container disk1 is a container on that disk, and Macintosh HD is a volume in that container. (Only APFS-formatted disks have containers.)
   
3. Select the disk that you want to erase, such as Apple SSD.
4. Check the information shown on the right side of the window to find out which partition map is currently in use:
   • GUID Partition Map is appropriate for Mac disks.
   • Master Boot Record is appropriate for external drives used with a PC or Boot Camp.
5. If the partition map is not appropriate for the disk's intended use, click the Erase button or tab, then complete these items:
   • Name: Enter a name that you want the disk to have after you erase it, such as Apple SSD.
   • Format: To format as a Mac disk, choose either APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
   • Scheme: Choose the appropriate partition map scheme.
6. Click Erase to begin erasing. If you're erasing your startup disk, you might be prompted to enter your Apple ID.
7. Quit Disk Utility when done.
8. If you want your Mac to be able to start up from this disk, choose Reinstall macOS from the Utilities window, then follow the onscreen instructions to reinstall macOS on the disk.

Why erase a disk

You can erase a disk or volume at any time, including in circumstances such as these:

• You want to quickly and permanently erase all content from your Mac and restore it to factory settings, such as when you're selling, giving away, or trading in your Mac.
• You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended).
• You received a message that your disk isn't readable by this computer.
• You're trying to resolve a disk issue that Disk Utility can't repair.
• The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer.
• The macOS installer says that you may not install to this volume because it is part of an Apple RAID.

About APFS and Mac OS Extended

Disk Utility in macOS High Sierra or later can erase most disks and volumes for Mac using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.

Identify the current format

If you want to know which format is currently in use, use any of these methods:

• Select the volume in the Disk Utility sidebar, then check the information on the right. For more detail, choose File > Get Info from the Disk Utility menu bar.
• Open System Information and select Storage in the sidebar. The File System column on the right shows the format of each volume.
• Select the volume in the Finder, then choose File > Get Info from the menu bar. The Get Info window shows the Format of that volume.

Choose between APFS and Mac OS Extended

If you want to change the format, answer these questions:

Are you formatting the disk that came built into your Mac?
If the built-in disk came APFS-formatted, don't change it to Mac OS Extended.

Are you about to install macOS High Sierra or later on the disk?
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files.

Are you preparing a Time Machine backup disk or bootable installer?
Choose Mac OS Extended (Journaled) for any disk that you plan to use with Time Machine or as a bootable installer.

Will you be using the disk with another Mac?
If the other Mac isn't using High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't mount APFS-formatted volumes.

Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS.

If your disk doesn't appear in Disk Utility

If Disk Utility doesn't show a sidebar, choose View > Show Sidebar from the menu bar.

If Disk Utility shows the sidebar, but your disk doesn't appear within it, disconnect all nonessential devices from your Mac. If the disk is external, leave it connected, but make sure that it's turned on and connected directly to your Mac using a good cable. Then restart your Mac and try again. If your disk still doesn't appear, your disk or Mac might need service. Learn how to get your Mac ready for service.

Learn more

• If you can't start up from macOS Recovery, you can instead use a different startup disk, if you have one.

BestCD/DVD Drives for MaciMore2020

If you've recently upgraded to a new iMac or MacBook Pro, you're probably going to need an optical drive if you want to continue importing your movies and music to iTunes, or just access the content on your discs. If you think you'll need an external drive mostly for Blu-Ray discs, most of them will also play DVDs and CDs but are not readable/writable drives for CDs or DVDs. Either way, here are some solid options.

No adapter needed: Confoly USB-C Superdrive

Staff pick

I have this model CD/DVD drive for my Mac computers for multiple reasons. For one, it's practically the same as Apple's SuperDrive in every way, and second, it's got a USB-C cable so I can connect it to my MacBook Pro without needing any additional adapters. Oh, there's a third reason, too. It comes with a USB-A adapter so I can connect it to any standard USB port.

$49 at Amazon

Cupertino's own: Apple USB SuperDrive

Apple's branded playable/burnable CD/DVD drive is the perfect complement to your iMac or MacBook Pro unless you have a late 2016 or newer MacBook Pro, in which case you'll need the USB-C to USB adapter. It's not much larger than the size of a CD case, so it fits snug in your computer bag without taking up a lot of room. All you have to do is plug it into your computer using the USB cable. There's no need for special software or external buttons that might get broken. It's solid, simple, and it looks great with your Mac products.

$79 at Amazon

USB-C and USB 3.0: VisionTech External CD/DVD Drive

With no eject button on the device and powered by USB the VisionTech External CD/DVD Drive is very slim and compact. You can tuck it away anywhere that makes the most sense for you. Preprogrammed for both Mac and Windows, you shouldn't need to do any formatting to get the drive to work. Plus, this drive has both USB 3.0 and USB-C cables, meaning you can plug it right into your MacBook with no adapter needed.

$31 at Amazon

Inexpensive choice: LG GP65NB60

LG makes a CD/DVD drive that is lightweight, fast, and doesn't cost much. It's made of a hard shell plastic material, so it isn't going to feel as sturdy as Apple's SuperDrive or Confoly's USB-C drive. However, in exchange, you get something that's about as light as a CD in its case.

$25 at Amazon

Also worth considering: Verbatim External CD / DVD Writer

Here's another inexpensive choice, this time from Verbatim. Weighing just 12 ounces, this CD/DVD burner is compact, lightweight, and USB powered. It's a suitable choice if you need to back up sensitive data, as well as music and video libraries.

$24 at Amazon

Still serving a need

There are a lot of reasons why you'd need a CD/DVD drive for your Mac, despite the concept being heavily outdated in 2019. Whether you want to digitize your DVD collection or just view a disc on your computer, an optical drive is cheap and sometimes necessary.

As you can see, we've selected the Confoly USB-C Superdrive as our favorite since it's super similar to Apple's SuperDrive and you don't need adapters to utilize it. If you're working with a small budget, take a look at the LG GP65NB60. It gets the job done for a surprisingly low price.

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Vintage-looking film cameras are all the rage. These are my favorites.

Get instant gratification and a dose of nostalgia with these instant film cameras. They're a fun throwback, sure, but which ones get the job done?