May 31, 2018 This article will walk you through how to check SMART status on hard disks in Mac OS, and it works with both SSD and HDD volumes. Checking SMART status of a drive can give you actionable information about whether a disk is about to fail and therefore is in need of an urgent data backup and drive replacement. May 30, 2018 Unfortunately, this test will require you to leave your Mac at the Apple Store, so they can run the test overnight as it can take anywhere from 1 to 4 hours to complete. If a full hard drive scan is included, add several hours to the test based on the size of the hard drive.
Keeping you Mac's hard drive or SSD healthy is hugely important. By monitoring and checking your Mac hard drive's health, you can anticipate potential problems and prevent potentially catastrophic crashes. How do you know if your Mac is working properly?
Fortunately, there are a number of tools available that allow to to check the health of a drive and fix problems before they become serious.
Best Apps to Check Your Mac Hard Drive Health
One of the best apps for alerting you to potential problems is iStat Menus, available in Setapp. Once you've installed it, iStatMenus sits in your Mac's menu bar and monitors not just your hard drive, but its CPU, RAM and network traffic, among other things.
Mac Os X Hard Drive Check
iStat Menus, and the other disk monitoring tools available for macOS, monitor what is knows as SMART status. SMART stands for Self-Monitoring, Analysis and Reporting Technology and is installed on most hard drives and SSDs. In order to use it, you need software to analyze and display what it finds, and that's where iStatMenus comes in.
Monitoring SMART reports won't prevent your hard drive from failing, but it will reduce the likelihood of problems occurring.
Note: As of 2016, Apple no longer allows software tools to check the SMART status of an SSD. So iStatMenus won't repot anything on Macs shipped in 2016 or later.
There are other steps you can take to keep your hard drive or SSD healthy. CleanMyMac X has a number of maintenance routines. While most of them are designed to keep your Mac running smoothly, one of them is an excellent way to keep your hard drive in good shape.
How to verify Startup disk
- Launch Setapp, search for CleanMyMac, and open it.
- When CleanMyMac has launched, look on the left hand side of its window for the Speed section and click Maintenance.
- Click the check box next to 'Repair Disk Permissions' to verify startup disk and then click the 'Run' button at the bottom of the window.
- Click OK in the dialog box that opens. Click 'Run' again. View the result
Identifying bad sectors with Disk Drill
Sectors are blocks of space on a disk drive and bad sectors are blocks that cannot be read because, for whatever reason, they're damaged. When Disk Drill attempts to recover data from a hard drive that's failed or one where you've mistakenly deleted files, it marks sectors it can't read from as bad. That means that it won't try to recover data from them in the future.
You can't fix bad sectors, the drive's firmware should identify them and prevent them from being written to. If there's data stored in them and you need to recover it, you're out of luck. But by monitoring how many of them there are on a drive, you can keep an eye on its health and decide whether it's time to replace it, if the number of bad sector starts to increase quickly.
Here's how to identify bad sector in Disk Drill:
- Open Disk Drill app in Setapp. When it launches, it will ask if you want to 'Monitor my disks for hardware issues'. Say Yes. If you already have Disk Drill installed but didn't check that option when you launched it the first time, go to the Preferences, click the SMART tab and check the box next to 'Monitor my disks for hardware issues.'
- Start a recovery session. In Disk Drill's main window, select the volume 'Macintosh HD', or whatever you've called your Mac's hard drive. Click Recover. Let the recover session run and complete.
- Check bad sectors. Once the recovery session has completed and saved, go back to the main Disk Drill window. Click the gear icon next to the drive you ran the recovery session on and click the bottom item on the menu 'Specify bad blocks.' This tool is designed to allow you to tell Disk Drill which blocks are bad and you don't want it to scan, but it will also display bad sectors it has identified.
How to avoid problems from an unhealthy hard drive
You should always backup your hard drive regularly, but it's even more important to do it when you suspect your hard drive is having problems. If you identify problems with a hard drive using any of the steps above, you should consider increasing the frequency of your backups and test them to make sure you can recover data if you need to – a backup routine is useless if you can't restore data. You should also consider using Get BackUp Pro to make a complete clone of the drive, that way, in an emergency you can boot from the clone and be back up and running immediately. Click here to read about how to backup your Mac. Get Backup Pro, also available in Setapp, is an excellent tool for making regular backups.
How to recover from a failed hard drive
If it's already too late and your hard drive has failed and lost data, you should try to recover the data before you do anything else.
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After isolating an issue on your Mac to a possible hardware issue, you can use Apple Diagnostics to help determine which hardware component might be causing the issue. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance.
If your Mac was introduced before June 2013, it uses Apple Hardware Test instead.
How to use Apple Diagnostics
- Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
- Make sure that your Mac is on a hard, flat, stable surface with good ventilation.
- Shut down your Mac.
- Turn on your Mac, then immediately press and hold the D key on your keyboard. Keep holding until you see a screen asking you to choose your language. When Apple Diagnostics knows your language, it displays a progress bar indicating that it's checking your Mac:
- Checking your Mac takes 2 or 3 minutes. If any issues are found, Apple Diagnostics suggests solutions and provides reference codes. Note the reference codes before continuing.
- Choose from these options:
- To repeat the test, click ”Run the test again” or press Command (⌘)-R.
- For more information, including details about your service and support options, click ”Get started” or press Command-G.
- To restart your Mac, click Restart or press R.
- To shut down, click Shut Down or press S.
Hard Drive Test Mac Os X
If you choose to get more information, your Mac starts up from macOS Recovery and displays a web page asking you to choose your country or region. Click ”Agree to send” to send your serial number and reference codes to Apple. Then follow the onscreen service and support instructions. When you're done, you can choose Restart or Shut Down from the Apple menu.
This step requires an Internet connection. If you're not connected to the Internet, you'll see a page describing how to get connected.
Diskutil repairVolume diskvolume identifier Solution 3: Reformat the external hard driveIf yourand Terminal, the file system of this drive might be seriously corrupted. The only way to fix this unmountable external drive is to reformat it. For example, if the volume identifier of an external hard drive is disk2s, you should enterdiskutil repairVolume disk2s. Diskutil listStep 3: Check the volume identifier from the table that appears.Step 4: Enter:diskutil repairVolume diskvolume identifier. Fortunately, you can still try to repair the corrupted external hard drive with Terminal.Step 1: Go to Applications TerminalStep 2: Enter: diskutil list (This will list out the available volumes). Mac os x index external drive offline.
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If holding down the D key at startup doesn't start Apple Diagnostics:
- If you're using a firmware password, turn it off. You can turn it on again after using Apple Diagnostics.
- Hold down Option-D at startup to attempt to start Apple Diagnostics over the Internet.