VirtualBox 報錯VERR_VD_IMAGE_READ_ONLY

VirtualBox 無法打開虛拟機，報錯VERR_VD_IMAGE_READ_ONLY，詳細報錯如下：

不能為虛拟電腦 Primary11gRAC2 打開一個新任務.

Failed to open image 'E:\Vbox\Primary11gRAC2\11.2.0.4RAC2\11.2.0.4RAC2.vdi' for writing due to wrong permissions (VERR_VD_IMAGE_READ_ONLY).

Failed to attach driver below us! Image is read-only. (VERR_VD_IMAGE_READ_ONLY).

AHCI: Failed to attach drive to Port0 (VERR_VD_IMAGE_READ_ONLY).

傳回 代碼:E_FAIL (0x80004005)
元件:ConsoleWrap
界面:IConsole {872da645-4a9b-1727-bee2-5585105b9eed}
      

表面來看是該虛拟媒體的權限是隻讀？而實際上去檢視權限并沒有發現和其他正常運作的虛拟機有任何差別。

那麼考慮是否該檔案被占用，是以無法修改？