我正在尝试添加标志swap，parted但令牌无效，为什么？
Model: Kingston DataTraveler 3.0 (scsi)
Disk /dev/sda: 15.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 512B 2000MB 2000MB primary ext4 boot, lba
(parted) set
Partition number? 1
Flag to Invert? swap
parted: invalid token: swap