1.Synology 12TB Enterprise-Grade SAS HDD (HAS5300-12T)

 Price: $610

• Capacity: 12TB
• Form Factor: 3.5"
• Interface: SAS 12Gb/s
• Rotational Speed: 7200 RPM
• Buffer: 256 MiB
• Series: HAS5300 (Enterprise-Grade)

2.Synology 20TB Enterprise-Grade SATA HDD (HAT5310-20T)

 Price: $950

• Capacity: 20TB
• Form Factor: 3.5"
• Interface: SATA 6Gb/s
• Rotational Speed: 7200 RPM
• Buffer: 256 MiB
• Series: HAT5310 (Enterprise-Grade)