求教格式化问题

[weixin_38054680]

[root@gcard32_cs1 /]# mkfs -t ext3 /dev/sdb7
mke2fs 1.22, 22-Jun-2001 for EXT2 FS 0.5b, 95/08/09
mkfs.ext3: No such device or address while trying to determine filesystem size
[root@gcard32_cs1 /]#

[root@gcard32_cs1 /]# mkfs -t ext2 /dev/sdb7
mke2fs 1.22, 22-Jun-2001 for EXT2 FS 0.5b, 95/08/09
mkfs.ext2: No such device or address while trying to determine filesystem size
[root@gcard32_cs1 /]#

帮忙看看是什么问题？在线等………………