华硕路由器RT-AC86U，USB3.0挂载硬盘报错。

错误信息：侦测到您的硬盘上存在错误。删除已损坏文件或使用电脑修复系统问题。

ntfsck 3016.5.3
Checking NTFS Superblock ...
Device name : /dev/sda2
NTFS volume version: 3.1
Cluster size : 4096 bytes
Current volume size: 4000768324096 bytes (4000769 MB)
Checking system files ...
Current device size: 4000768327680 bytes (4000769 MB)
Checking for bad sectors ...
Scanning $MFT ...
Checking attributes ...
0.00 percent completed
39.22 percent completed
78.43 percent completed
100.00 percent completed
Checking directory structure ...
Checking for orphaned files ...
0.00 percent completed
39.22 percent completed
78.43 percent completed
100.00 percent completed
Failed to calloc 122093760 bytes: Cannot allocate memory
Scanning orphaned files completed.
Checking cluster allocation ...
ERROR(12): Failed to setup allocation bitmap: Cannot allocate memory
Done NTFS checking and repair on device '/dev/sda2'.
Syncing device ...

西数4T红盘，一直在NAS里挂着肯定没有损坏。
GPT分区、NTFS格式、基本磁盘和动态磁盘我都试过了。
硬盘是空的，格式化过了。
固件是官方最新的，也还原过出厂。