It provides information on loading Windows and on the partition of the disk. MBR, which stands for Master Boot Record, is the first sector on an MBR or GPT disk. If 'disk unknown not initialized' is accompanied by 'unallocated', the likely cause is MBR corruption on the hard drive. When the issue occurs, your external hard drive may show 'unallocated space' or nothing about the disk capacity in Disk Management (as shown in the image below), so you are not able to open and access the data on this disk.Īlthough the disk shows 'Unknow, Not Initialized' in both situations, they present different information about the capacity of the hard drive, which means they are caused by different reasons.

Like the case above, 'Disk Unknown Not Initialized' issue usually occurs unexpectedly in all the Windows version, including Windows 11/10/8/7, and it annoys users. Does anyone know how to recover data when a hard drive is not initialized or how to initialize disk without losing data?' Symptoms Also when I went into system tools it said that disk 1 is unknown, not initialized, unallocated. 'When I plugged in my external hard drive, Western Digital My Passport 0740 (500GB), PC said that it's successfully installed however it did not appear on My Computer.

Send for Manual Repair Disk 1 Is Unknown, Not Initialized, Unallocated

Recover Data from Hard Drive and Create New Volumes Solution 3.

Hard drive unknown not initialized