QNAP TS-420 NAS Storage Device with 4 x 4TB (16TB) Hitachi HDDs

Description

Used QNAP TS-420 4 Bay NAS.
Comes with 4 4TB HGST Hard Drives.
Has latest firmware and formatted and ready for use.
3 of the drives show good smart status, and one (Disk3) has a warning, but the rapid self test shows no errors and I have been using the drive like this for over a year with no issues at all. You could pull this disk and have a full array of good drives but it works fine as is.
Specs:
CPU
Marvell 1.6GHz
DRAM
512MB DDR3 RAM
Flash Memory
16MB
HDD
4 x 3.5" or 2.5” SATA HDD/ SSD
NOTE:
1. Maximum raw capacity: 16TB
2. The system is shipped without HDD.
HDD Tray
4 x swappable tray
LAN Port
2 x Gigabit RJ-45 Ethernet port
LED Indicators
STATUS, LAN, USB, eSATA, HDD 1, HDD 2, HDD 3, HDD 4
USB
2 x USB 2.0 port  (Front x1; Back x1);
2 x USB 3.2 Gen 1 port (Back)
Supports USB printer, disk, pen drive, USB hub, and USB UPS, etc.
eSATA
2 x eSATA port (Back)
Buttons
Power button, USB one-touch-backup button, reset button
Alarm Buzzer
System warning
Form Factor
Tower
Dimensions
177(H) x 180(W) x 235(D) mm
6.97(H) x 7.09(W) x 9.25(D) inch
Weight
Net weight: 3 Kg (6.61 lbs)
Gross weight: 4.6 Kg (10.14 lbs)
Power Consumption (W)
Sleep mode: 13W
In operation: 31W
(with 4 x 500GB HDD installed)
Temperature
0~40˚C/ 32~104°F
Humidity
5~95% RH non-condensing, wet bulb: 27˚C.
Power Supply
External power adaptor,90W, Input: 100-240V
Secure Design
K-lock security slot for theft prevention
Fan
1 x quiet cooling fan (9 cm, 12V DC)