How many 4tb disks does tr-004-44r-us include?

None. It's the RAID controller and enclosure only. you buy the disks separately in the size of your choosing. I recommend that you use one of the following models: WD Red, WD Gold , WD Purple, Seagate Ironwolf, or Seagate Skyhawk. These drives are made for use in RAID arrays, and will give you far fewer issues with the array loosing sync and having to rebuild. I'm using WD Red drives in a RAID 5 configuration in mine and love them. I've had the array up and running for almost a year and have never had any problems at all. Make sure to use 4 drives of the same size, make, and model for best performance and reliability.

Is it possible to password protect this device?

Not native to the device. It is just an external USB drive array. It can be managed from a QNAP NAS and you can password protect data from within the app, but you cannot password protect the actual drive itself.

I can leave this turn on 24/7 like any other nas like synology units? note: i know this is a das not a nas

I don't have this model, but yes to your answer. You can leave it on 24/7/365 if you want. whatever you have it connected to will control it and put it in sleep mode when not in use.

1. Can I plug this into my pc to expand its storage? 2. Can I use this with a c to usb adapter as my pc does not have a c slot

1. Yes. You might/probably need to download their management software 2. Don't need an adapter because the PC connection is via a common USB type A plug. The "C" end plugs into the device. It's kind of short though.

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QNAP TR-002-A-US 2 Bay USB Type-C Direct Attached Storage (DAS) with Hardware RAID (Diskless)

QNAP TR-002-A-US 2 Bay USB Type-C Direct Attached Storage (DAS) with Hardware RAID (Diskless)

Product ID: 512531612

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Details

Digital storage capacity
2000 GB
Hard disk interface
Serial ATA
Connectivity technology
USB
Brand
QNAP
Special feature
LED Light
Hard disk form factor
3.5 Inches

⚡USB 3.2 Gen 2 Type-C 10Gbps speed

🔒Lockable 2-bay SATA drive enclosure

🛡️Hardware RAID 0,1, JBOD, individual disk modes

Description

🚀 Unlock next-level storage speed and security — because your data deserves the best!

SECURE RELIABLE - Lockable drive bays safeguard your valuable data while the robust build ensures long-term durability for your critical backups.
DUAL DRIVE EXPANSION - Easily scale your storage with two 2.5/3.5-inch SATA bays, compatible with both HDDs and SSDs to suit your performance needs.
VERSATILE RAID OPTIONS - Customize your storage with hardware RAID support including RAID 0, 1, JBOD, or use individual disks for ultimate flexibility and data protection.
BLAZING FAST CONNECTIVITY - Experience ultra-responsive data transfers with USB 3.2 Gen 2 Type-C at 10Gbps, perfect for seamless multitasking.
CROSS PLATFORM COMPATIBILITY - Plug and play with Windows, macOS, and Linux systems, ensuring smooth integration into any professional workflow.

The QNAP TR-002-A-US is a diskless 2-bay direct-attached storage enclosure featuring USB 3.2 Gen 2 Type-C connectivity for ultra-fast 10Gbps data transfer. Supporting 2.5/3.5-inch SATA drives and hardware RAID modes (0,1, JBOD, individual), it offers versatile, secure, and scalable storage expansion compatible with Windows, macOS, and Linux.

Specifications

Brand	QNAP
Package Dimensions	26.8 x 24 x 20.4 cm; 2.22 kg
Item model number	TR-002-A-US
Manufacturer	QNAP
Series	TR-002-A-US
Colour	Diskless
Form Factor	3.5-inch
Hard Disk Description	Diskless
Hard Drive Interface	Serial ATA
Hard Disk Rotational Speed	7200
Hardware Platform	Mac
Item Weight	2.22 kg
Guaranteed software updates until	unknown

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