linux安装The storage device below may contain data？

he storage device below may contain data.
ATA HGST HTS725050A7
476940.023438 MB pci-0000:00:1f.2-scsi-0:0:0:0
We could not detect partitions or filesystems on this device.
This could be because the device is blank, unpartitioned or virtual.
Are you sure this device does not contain valuable data?
Yes, descard any data.
No, keep any data.
提示要清空所有数据，如果选择NO则退出安装，好像是分区的问题，请问该怎么解决？（在win7上装centos6.5,不格式化硬盘的前提）