Lowest Price $909.99 Compare NETGEAR RNDU4220-100NAS prices
Warranty 3 years limited


RJ45 Ports2 x 10/100/1000M
USB Ports3 x USB2.0
eSATA PortsYes
Other Ports1 x PCIe


Drive Bays4
Hard Disk Interface4 x SATA
Hard Disk Size4TB (2x2TB)
Rotational Speed7200RPM


X-RAID2 - Manage volume expansion automatically as you add new hard drives or replace existing drives with larger capacity drives.

Delivers over 80 MBps throughput

ReadyNAS Remote - Get secure drag-and-drop remote access without complicated network setups.

ReadyNAS Vault - Backup critical files off-site for added security and peace of mind, then access and restore them remotely online.

Rsync - Replicate and synchronize files between two ReadyNAS devices.

TiVo Compatible - Store your favorite television and stream them back to any TiVo DVR in your home.

Media Shifting with Skifta - Access multimedia content from your ReadyNAS while you’re away from home on connected DLNA devices.

Transcoding with Orb - Convert multimedia content for optimal streaming on mobile devices.

Automatic Backups - Back up three computers (PC or Mac) continuously using Memeo Premium Backup and restore any previous version of a file with a simple right-click.

For the Hard drives compatibility, please go to

The firmware that is needed for Netgear NAS products to be compatible with 3TB drives (assuming it did not come with a 3TB drive) is RAIDiator 4.2.17. For more details, please go to this link below to download this software.

Please visit the following link to get the latest software for your ReadyNAS product.

Form Factor

Dimensions 8.78" x 8.07" x 5.28"
Weight 10.35 lbs. without disks lbs
Form Factor 4-Bay


Data Link Protocol
Network Interface Controller
DLNA Certified Yes


Standards IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
Supported Protocols CIFS/SMB for Windows
AFP for Mac OS
NFS for Linux and UNIX
HTTP/S for Web browsers
FTP/S Support
Processor Intel Atom single-core processor
RAID RAID 0, 1, 5 and JBOD
LEDs Status, LAN, USB, eSATA, Power, HDD 1, HDD 2, HDD 3, HDD 4
Power 120W server-rated AC power supply
Input: 100-240V AC, 50/60 Hz
Temperature 0°C - 40 °C
Humidity 20-80% Humidity (non-condensing)


Operating System Windows, Mac OS 10, Linux
Management Volume Management
- X-RAID2 auto volume expansion technology
- Multiple volume support for RAID 0, 1, 5
- Journaling mode
- User, group, and share-level quotas
- Built-in iSCSI target service