![](https://www.yinfor.com/wp-content/uploads/2018/05/four-wd-disks-500x305.jpg)
Add a hard disk to my NAS
When I travel to Shanghai, I ordered a Western Digital Purple Disk. 4TB SATA6Gb / s 64M Monitoring Hard Drive (WD40EJRX). I paid RMB705, including free shipping. Now the price is dropped to RMB659. The similar hard disk on newegg.ca...