MemTest86 boots from a USB flash drive and tests the RAM in your computer for faults using a series of comprehensive algorithms and test patterns. Learn More Why test. All the tools you need to test and diagnose computer hardware. A durable polypropylene case with snap latches and a carry handle. 6 high-quality hardware tools in one location. H2testw is a free tool that can be used to test for Counterfeit or Fake USB flash drives, and check your USB Flash Drive for errors. It works by filling the chosen target drive with test data and then reads this data back to verify it. Finally, if your thumb drive is good, the test will finish without any errors.

Grab my script, open the ZIP file. In the folder that is created (probably called 2e5eed7dbfbd5dd7e929-6ddeffa2f729c8657e3c460e0ed540!) drag that script onto Terminal. Then drag the AHT disk image onto Terminal & finally drag the destination disk (a USB disk formatted to Macintosh OS Extended). Before we begin, we first need a USB hard drive. For this tutorial, I am using an old 320GB USB drive. You can use any type of USB hard drive you wish, though I recommend using a portable hard drive that doesn’t need a power supply so it’s a lot more travel-friendly and easier to use. Create Apple Hardware Test on USB flash drive (confirmed working) - Duration: 4:27. Everything Mac 21,298 views. The Top 5 Things You Should Do First When You Get a New Mac - Duration: 9.

When building an Android app, it's important that you always test your app ona real device before releasing it to users. This page describes how to set upyour development environment and Android device for testing and debugging overan Android Debug Bridge (ADB) connection.

Set up a device for development

Before you can start debugging on your device, there are a few things you mustdo:

1. On the device, open the Settings app, select Developer options, andthen enable USB debugging.

   Note: If you do not see Developer options, follow the instructions toenable developer options.

2. Set up your system to detect your device.

   • Chrome OS: No additional configuration required.
   • macOS: No additional configuration required.

   • Ubuntu Linux: There are two things that need to be set up correctly:each user that wants to use adb needs to be in the plugdev group,and the system needs to have udev rules installed that cover the device.

     plugdev group: If you see an error message that says you're not in theplugdev group, you'll need to add yourself to the plugdev group:

     Note that groups only get updated on login, so you'll need to log out forthis change to take effect. When you log back in, you can use id tocheck that you're now in the plugdev group.

     udev rules: The android-sdk-platform-tools-common package containsa community-maintained default set of udev rules for Android devices. Toinstall:

   • Windows: Install a USB driver for ADB. For an installation guide andlinks to OEM drivers, see the Install OEM USB driversdocument.

Connect to your device

When you are set up and plugged in over USB, you can click Run in Android Studio to build and run your app on the device.

You can also use adb to issue commands,as follows:

• Verify that your device is connected by running the adb devices commandfrom your android_sdk/platform-tools/ directory. Ifconnected, you'll see the device listed.
• Issue any adb command withthe -d flag to target your device.

Troubleshoot device connection with the Connection Assistant

The Connection Assistant provides step-by-step instructions to help you set upand use a device over the ADB connection.

To start the assistant, choose Tools > Connection Assistant.

The Connection Assistant provides instructions, in-context controls, and a listof connected devices in a series of pages in the Assistant panel. Use theNext and Previous buttons at the bottom of the Assistant panel towork through the pages as needed:

• Connect your device over USB: The Connection Assistant begins by promptingyou to connect your device over USB, and it provides a Rescan USB devicesbutton with which you can start a new scan for connected devices.
• Enable USB debugging: The Connection Assistant then tells you how toenable USB debugging in the on-device developer options.
• Restart the ADB server: Finally, if you still don't see your device on thelist of available devices, you can use the Restart ADB server button on thelast page of the Connection Assistant. Restarting the ADB server also causesADB to scan for devices again. If you still don't see your device on the listof available devices, try the troubleshooting steps in the next section of thispage.

Resolve USB connection issues

If the Connection Assistant is not detecting your device over USB, you can trythe following troubleshooting steps to resolve the issue:

Check that Android Studio can connect to the Android Emulator

To check if the issue is being caused by a connection problem between AndroidStudio and the Android Emulator, follow these steps:

1. Open the AVD Manager.
2. Create a new AVD if you don't alreadyhave one.
3. Run the emulator using your AVD.
4. Do one of the following:
   • If Android Studio can't connect to the emulator, download the latest SDK Platform Toolsand then try again.
   • If the emulator starts successfully, check the USB cable.

Check the USB cable

To check if the issue is being caused by a faulty USB cable, follow the steps inthis section.

If you have another USB cable:

1. Connect the device using the secondary cable.
2. Check if the Connection Assistant can now detect the device.
3. If the device is not detected, try the primary cable again.
4. If the device still isn't detected, assume that the problem is with thedevice and check if the device is set up for development.

If you don't have another USB cable but you do have another Android device:

1. Connect the secondary device to your computer.

2. If the Connection Assistant can detect the secondary device, assume that theproblem is with the primary device andcheck if the device is set up for development.

   If the secondary device is not detected, the problem might be with the USBcable.

Check if the device is set up for development

To check if the issue is being caused by settings on the device, follow thesesteps:

1. Follow the steps in the Set up a device for developmentsection.
2. If this does not resolve the problem, contact the device OEM'scustomer support for help. Tell the customer support representative that thedevice won't connect to Android Studio using ADB.

RSA security key

When you connect a device running Android 4.2.2 (API level 17) or higher to yourcomputer, the system shows a dialog asking whether to accept an RSA key thatallows debugging through this computer. This security mechanism protects userdevices because it ensures that USB debugging and other adb commands cannot beexecuted unless you're able to unlock the device and acknowledge the dialog.

Using the reference code table

1. Find the definition of the specific Apple Diagnostics reference code and learn what next steps are needed to troubleshoot the issue.
2. For issues you cannot resolve, contact Apple or take your computer to an Apple Authorized Service Provider or Apple Retail Store to find out which service and support options are available. Be sure to share the Apple Diagnostics reference code with Apple or your service provider. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar (available in some countries and regions only).

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