Right-click on the not initialized disk (HDD or SSD) and select "Initialize Disk". External links disclaimer blogs.systweak.com website may contain links to external websites that are not provided or maintained by or may not be in any way affiliated with Systweak Blogs Please note that the Systweak Blogs does not guarantee the accuracy, relevance, timeliness, or completeness of any information on these external websites. Running Disk Utilities to check disk error, here I provide CHKDSK utility. A week ago, my WD Elements External Hard Disk is not displaying under hard disk drives, but does display under Devices and Printers. When you try to use an external hard drive on your Windows 10, you may meet the problem that your Disk 1 unknown not initialized in Windows Disk Management. Run CMD to Initialize HDD or SSD I have tried initializing the disk from Disk Management, but it won't format and I keep getting 'The request could not be performed because of an I/O device error'. Step 3. 3. This problem can also appear in various other scenarios and it’s really important to resolve it since you are unable to … 1) Open Command Prompt. I have checked the Disk Management and saw that it is Unknown, Solution 3. I would like to add you should source another HDD like western digital, since Seagate of late have made some crappy hdds, once you recover mbr , backup everything to the new drive, and do a full s.m.a.r.t check and bad sector check because you could have bad sectors forming, immediately noticeable if capacity of your drive has changed eg, 3tb showing up as 750gigs. EaseUS data recovery software supports deleted data recovery, formatted file recovery, RAW file recovery and more. It is shown as Disk unknown, not initialized, no disk space, like the following screen shot: Or it is shown as Disk unknown, not initialized, unallocated space in Windows Disk Management. Infopackets Reader Greeshma N. writes: " Dear Dennis, I have an external hard drive that has worked fine for years. 3) After checking disk error, retry the command: diskpart If the issue persists, please continue the step. It works properly before, but something must have happened and it does not work properly now. The hard drive is damaged physically or logically; The file system of the hard drive is incompatible with the computer; The drivers need to be updated 2. 2) Type: chkdsk /f. Windows 7: Disk 2 (external hard disk) is Unknown, Not Initialized Hello, I have run into a problem that has been causing me quite a bit of headache as of late. The problem when users struggle to initialize their disk on Windows 10 usually appears when inserting a brand new external hard drive or SSD. 4) Try to initialize disk. If you have important data lost on the external hard drive, USB flash drive, or SD card after fix the I/O device error, you can recover your files with hard drive recovery software - EaseUS Data Recovery Wizard. I have a WD Elements portable hard disk. The disk shows unknown not initialized in disk management and many users know it is time to get it initialized. Reboot PC, and then your disk will be initialized to create new partitions on it for storing new data. Select the disk(s) to initialize in the Initialize Disk dialog box and set the disk partition as MBR or GPT. When you encounter the issue of disk unknown not initialized in Windows 10/8/7, you can try multiple solutions to fix it, for example, initialize your hard drive, rebuild MBR, perform partition recovery or recover data from unknown disk, turn off your PC and remove the battery and replace the bad hard … Now the hard drive won't show up in My Computer, though it shows up under Devices and Printers - very strange! 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