Open the Settings app. Choose Touch ID & Passcode or Face ID & Passcode, depending on the device. Enter your passcode to access the settings. Scroll down to the bottom of the app where it says 'USB Accessories.' Apple’s Mac OS X does support PTP, so you can use PTP mode to transfer photos from an Android device to a Mac over a USB connection without any special software. If you have an older Android device, you may be forced to use USB mass storage.

Nowadays, when you buy a USB drive, you can use it right out of the box with your Mac. However, unless it’s been designed for use with a Mac, it won’t be formatted using macOS’ preferred file system (either Mac OS Extended or APFS, depending on which version of macOS you’re running).

That’s because most of the computers in the world run Windows, and Windows uses a different file system, usually one known as Fat32. Drives formatted as Fat32 can be read from and written to by macOS, but it’s not optimal and you’re more likely to run into problems than if you use macOS’ native format. So, if you’ve bought a USB drive that’s formatted as Fat32, or any other format other than Mac OS Extended (also known as HFS+) or APFS, here’s how to format a USB drive on Mac. It’s exactly the same procedure if you need to reformat a flash drive on a Mac.

How to format a USB drive on a Mac

1. Plug the drive into a USB socket (if you have a recent MacBook or MacBook Pro that only has USB-C connectors, you’ll need a USB-C to USB-A adaptor).

2. Open a new Finder window and click on the drive. Make sure it has no files on it that you need. The process of reformatting it will wipe all the data from it.

3. Once you’ve copied any files you need from the USB drive to your Mac, go to Applications>Utilities and double-click on Disk Utility.

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4. Click on the USB drive in the sidebar and then choose Erase from the toolbar at the top of the window.

5. In the window that drops down type a name for the formatted drive in the box next to Name.

6. Choose a format from the dropdown menu.

7. If you have previously stored sensitive data on the drive, click the Security tab.

8. Choose a security level using the slider. The further to the right you move the slider, the more ‘passes’ the erase tool will make and the more securely files will be deleted. However, it also increases the time it takes to format the drive quite considerably.

9. Click Ok then click Erase.

Tip: You don’t need to erase a whole drive to delete files securely. If you have confidential files or sensitive data you need to remove from your Mac completely, you should use CleanMyMac’s File Shredder. It’s specifically designed to securely delete sensitive data and will render it unrecoverable. You can download CleanMyMac X for free here.

Which format to choose?

If your Mac is running macOS High Sierra or later, you have two options for file formats: APFS and Mac OS Extended. Which should you choose? The key point is that disks formatted as APFS won’t be recognized by Macs running versions of macOS older than High Sierra. So if you think you might need to plug the USB drive into a Mac running an older version of macOS, format it as Mac OS Extended.

APFS is optimized for SSD (solid state drive) such as flash drives, so if you reformat a flash drive on a Mac, you should definitely choose APFS (unless you plan to use it with a pre-High Sierra Mac, of course). Even on hard drives, however, APFS is faster and more reliable than Mac OS Extended.

Finally, if you plan to use the USB drive as a destination for Time Machine backups, choose Mac OS Extended. Time Machine can’t currently back up to an APFS disk and if you select one for use with Time Machine, it will offer to reformat it as Mac OS Extended. You can, however, backup an APFS formatted disk to a Mac OS Extended Time Machine drive.

How to format a USB drive to FAT32 on a Mac

The main reason for formatting a USB drive as Fat32 on a Mac is that you want to be able to use the drive on a Windows PC, as well as a Mac — perhaps to transfer files between the two machines. You may also be preparing the drive for use as, say, a storage device for a media player or to record TV programmes on a TV with a USB port.

The fact that Fat32 can be read from and written to on both Mac and Windows makes it very versatile. However, there is a significant limitation — individual files have a maximum size of 4GB. So, if you’re using the USB drive to store large video files, you may run into trouble. There is a solution, however, exFAT. Unlike FAT32, exFAT doesn’t have a maximum file limit. Better still, it can be read from and written to on any Mac running Mac OS X Snow Leopard or later and on Windows.

To format a USB drive in FAT32 or exFAT:

1. Plug the USB drive into your Mac.

2. Go to Applications>Utilities and launch Disk Utility.

3. Click on the USB drive in the sidebar in Disk Utility.

4. Click Erase in the Disk Utility toolbar.

5. Type in a name for the formatted disk.

6. Click on the Format menu and choose either MS-DOS (FAT32) or ExFAT.

7. Click Erase.

Your USB drive will now be erased and re-formatted as either FAT32 or ExFAT, depending on the format you chose in step 6.

How to manage your drives easily

If you look for a quick and easy way to manage your drives, try using CleanMyDrive 2. With its help, you can drag-and-drop files directly to any drive, clean hidden junk from external drives, and check disk stats. It works for all drives, including USB drives, SSD, SD cards, external hard drives. All the drives will be at hand in the menu bar, so you can get to see types of drives you have and manage them easily. CleanMyDrive is absolutely free to use, so download it on the Mac App Store and enjoy!

It’s very easy to format a USB drive on a Mac using Disk Utility. There are a couple of things you should keep in mind, however. The first is that when you format and disk, you will erase all the data currently on it. So if you need that data, make sure you copy it onto another disk before you start. Secondly, there are several formats to choose from, each with advantages and disadvantage. Use the guide above to help you decide which is right for you.

These might also interest you:

Picture Transfer Protocol (PTP) is a protocol developed by the International Imaging Industry Association to allow the transfer of images from digital cameras to computers and other peripheral devices without the need of additional device drivers. The protocol has been standardized as ISO 15740.

It is further standardized for USB by the USB Implementers Forum as the still image capture device class. USB is the default network transport media for PTP devices. USB PTP is a common alternative to the USB mass-storage device class (USB MSC), as a digital camera connection protocol. Some cameras support both modes.

Description[edit]

PTP specifies a way of creating, transferring and manipulating objects which are typically photographic images such as a JPEG file. While it is common to think of the objects that PTP handle as files, they are abstract entities identified solely by a 32-bit object ID. These objects can however have parents and siblings so that a file-system–like view of device contents can be created.

History[edit]

Until the standardization of PTP, digital camera vendors used different proprietary protocols for controlling digital cameras and transferring images to computers and other host devices. The term 'Picture Transfer Protocol' and the acronym 'PTP' were both coined by Steve Mann, summarizing work on the creation of a Linux-friendly way of transferring pictures to and from home-made wearable computers,^[1] at a time when most cameras required the use of Microsoft Windows or Mac OS device drivers to transfer their pictures to a computer.

PTP was originally standardized as PIMA 15470 in 2000, while it was developed by the IT10 committee. Key contributors to the standard included Tim Looney and Tim Whitcher (Eastman Kodak Company) and Eran Steinberg (Fotonation).

Storage[edit]

PTP does not specify a way for objects to be stored – it is a communication protocol. Nor does it specify a transport layer. However, it is designed to support existing standards, such as Exif, TIFF/EP, DCF, and DPOF, and is commonly implemented over the USB and FireWire transport layers.

Images on digital cameras are generally stored as files on a mass storage device, such as a memory card, which is formatted with a file system, most commonly FAT12, FAT16 or FAT32, which may be laid out as per the Design rule for Camera File system (DCF) specification. But none of these are required as PTP abstracts from the underlying representation.

By contrast, if a camera is mounted via USB MSC, the physical file system and layout are exposed to the user.

Device control[edit]

Many modern digital cameras from Canon and Nikon can be controlled via PTP from a USB host enabled computing device (Smartphone, PC or Arduino for example). As is the norm for PTP, the communication takes place over a USB connection. When interacting with the camera in this manner, it is expected that the USB endpoints are in (synchronous) Bulk Transfer Mode, for getting/setting virtually all the camera's features/properties (such as ISO, Aperture, Shutter speed and focus). Events raised by the camera, in response to specific actions performed by the host device, are sent back to the host via the USB asynchronous Interrupt endpoint.

In addition to changing the camera's settings and operating mode, it is possible to receive a through-the-lens view using 'Live View'. As described above, the storage objects of the camera's memory cards can be manipulated too.

By controlling a camera in this way it is possible to augment its capabilities. For example, if the controlling software was running on a Smartphone with GPS functionality, it would be possible to add the GPS coordinates to an image's Exif data, at the time of image capture - even if the camera itself had no GPS functionality.

Extensions[edit]

A number of protocols have been developed that extend PTP. PTP/IP, developed by FotoNation and first implemented in a round of Wi-Fi digital cameras by Nikon, Canon, and Eastman Kodak, allows data transfer over any IP-based network.

Media Transfer Protocol (MTP), developed by Microsoft, allows for transfer over wireless or wired networks based in part on FotoNation's PTP/IP, but also allows users to transfer other media aside from pictures, as well as for tagging objects with extended metadata (such as title, artist and similar).

Operating system support[edit]

Microsoft Windows has supported PTP from Windows ME onwards (excluding Windows CE). Microsoft implements PTP on Windows through Windows Image Acquisition.^[2][3] A disadvantage of PTP on Windows as compared to USB mass storage is that Windows does not assign drive letters to PTP devices, so image files on them cannot be manipulated by scripts or standard Windows programs, only by Windows Explorer or applications with specially written PTP support. Also, Windows Explorer does not display file modification timestamps (though these are available via the file Properties popup).

PTP on Linux and other free and open-source operating systems is supported by a number of libraries, such as libgphoto and libptp, used by applications such as digiKam and F-Spot.^{[citation needed]} As on Microsoft Windows there is no native support on Linux, but by means of GVfs the devices can easily be mounted and made available to applications that use standard POSIX commands and library functions.

Android has PTP support, although as with MTP, a limitation is that when transferring photos from one's computer to the Android device, file timestamps are replaced with the time of the copy (with copies in the other direction, from device to computer, timestamps are preserved).

The Poseidon USB stack on Amiga includes ptp.class.^{[citation needed]}

Version 1.1[edit]

PTP v1.1 (ISO15740:2008) is an update to PTP that has recently been published by ISO.^[4]

As of the middle of 2008, most devices and operating systems do not yet support PTP v1.1. This updated version of PTP is fully backward-compatible with PTP v1.0, and offers optional performance, compatibility, and feature enhancements including:

• A mechanism for handling streaming content
• A mechanism to support multiple vendor extension sets
• Support for objects larger than the 4GiB size limit set by PTP v1.0, by requiring 64 bits (8 bytes) for object size
• Support for retrieval of ObjectHandles in enumerated chunks. This may reduce long response times for some devices that possess large numbers of objects
• Support for arbitrary resizing prior to image transmission (responder scaling). In PTP v1.0, image sizes might be requested in full-resolution or thumbnail size only
• Support for arrays of datasets. This can be used to reduce the number of required transactions necessary for device characterization from being a function of the number of objects on the device down to one
• A fast file characterization operation that exploits dataset arrays to request, in a single transaction, only the minimum data required to characterize a typical filesystem
• A new standard ObjectFormatCode to support the Digital Negative (DNG) file format

Drawbacks[edit]

• Renaming file objects directly is not possible without copying or rewriting them
• Modification of file contents is not supported (the file needs to be re-transferred completely)
• Some drawbacks are OS-specific — see § Operating system support

See also[edit]

References[edit]

1. ^Steve Mann (1999-02-01). 'University of Toronto WearComp Linux Project, part 1 of a 2-part series' (58). Linux Journal: 5. Retrieved 2013-12-28.Cite journal requires journal= (help)
2. ^'About Windows Image Acquisition'. MSDN. Microsoft. Retrieved 2009-01-05.
3. ^'Still image connectivity for Windows'. Microsoft. December 4, 2001. Retrieved 2009-01-05.
4. ^'ISO 15740:2008'. International Organization for Standardization. 2008-04-22. Retrieved 2009-01-05.

External links[edit]

• PTP transport over USB specifications, USB.org.
• Microsoft and FotoNation Team to Support the Media Transfer Protocol For Wireless Digital Still Cameras, Microsoft News Center.