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VirtualBoxにあるCentOS7で[Insert Guest Additions CD image...]を押下したら Unable to insert the virtual optical disk となった時の確認方法 #Mac - Qiita
![Could not mount the media/drive 'D:\Ubuntu\VBoxGuestAdditions.iso' ( VERR_PDM_MEDIA_LOCKED)._ubuntu could not mount the media/drive "d:twboxybo-CSDN博客 Could not mount the media/drive 'D:\Ubuntu\VBoxGuestAdditions.iso' ( VERR_PDM_MEDIA_LOCKED)._ubuntu could not mount the media/drive "d:twboxybo-CSDN博客](https://img-blog.csdnimg.cn/4b06d6dd976c43c5951ad7e8e39a0b0f.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAbTBfNTIxNDEwNDk=,size_20,color_FFFFFF,t_70,g_se,x_16)