Replaced 4x2tb drives with 4x 4 tb drives one by one while in raid 5, i expected the tr004 to recognize extra space on last replacement. not. so how?

RAID does not work like that. When you create an ARRAY, the configuration is written to a configuration file that is either stored on the drives/array or whatever software RAID file you are using. Even in Enterprise Storage, this is how it works. Swapping out to a larger drive will not increase your disk space. You would need to backup your data, then wipe and create a new ARRAY.

How large of a hd tb size is it compatible with?

I've got 4x WD Red Pro 20TB - WD201KFGX running in mine just had to upgrade the firmware to v1.2 (anything lower won't work). Just put in a single drive that's less than that size, plug into your machine, and run the "QNAP External Raid manager" utility to update the firmware (all on their support site).

can it connect directly to router without pc ?

I connected it to my PC first, formatted the 4-drives in raid 10 (NTFS) (using hardware switches, NOT software), created the folders I wanted in it, then connected it to my ASUS router which has inputs for USB storage devices, and all of my computers in the house can "see" the raid and use it for storage.

Can i set this up for raid 1 with 2 drives and jbod/single with the other 2 drives?

I think the question is implying can you set this unit up with two concurrent RAID volumes. A) A RAID 1 set with drives in slot 1 & 2 and concurrently B) a JBOD set with drives in slot 3 & 4. Based on DIP switches, no. It would need multiple sets of dip switches to accomplish this and it appears there is only one set of switches on the chassis. By software, it is a possibility if the management software is slick enough to support this. It would come down to what QNAP provided in the software management console. As I don't have one of these yet, I can't confirm.

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Description

🚀 Unlock storage power with QNAP TR-004 — your RAID-ready, ultra-fast data vault!

SECURE COMPACT DESIGN - Lockable metal drive bays keep your drives safe while the sleek mini-ITX form factor fits perfectly on any desk.
PLUG AND PLAY CONVENIENCE - Includes USB Type-C to Type-A cable and all mounting screws for quick setup—no tech headaches, just storage power.
VERSATILE HARDWARE RAID SUPPORT - Choose from RAID 0, 1, 5, JBOD, or individual disk modes to tailor your data protection and performance needs.
BLAZING FAST USB TYPE C CONNECTIVITY - Seamlessly transfer data at up to 5Gbps with universal USB Type-C compatibility for Windows, macOS, and Linux.
EXPAND YOUR NAS STORAGE EFFORTLESSLY - Boost your QNAP NAS capacity instantly with direct-attached storage designed for hassle-free backup and expansion.

The QNAP TR-004 is a diskless 4-bay direct-attached storage enclosure featuring USB Type-C connectivity with 5Gbps transfer speeds. It supports multiple hardware RAID configurations (0,1,5, JBOD) for customizable data protection and performance. Designed for seamless NAS expansion and backup, it includes lockable metal drive bays and comes with all necessary cables and screws for easy installation. Compatible with Windows, macOS, and Linux, the TR-004 is a compact, high-speed storage solution backed by a 2-year warranty.

Specifications

ASIN	B07K4RC7X9
Additional Features	Compact, fast speed
Best Sellers Rank	#9 in Network Attached Storage (NAS) Enclosures
Brand	QNAP
Built-In Media	Drive tray keys x 2, Power Adapter, Power Cord x 1, Quick Start Guide, Screws for 2.5-inch drives x 12, Screws for 3.5-inch drives x 16, TR-004 external RAID enclosure, USB Cable, USB cable clip x 1
Cache Memory Installed Size	1
Color	Diskless
Compatible Devices	Computers
Connectivity Technology	USB
Customer Package Type	Standard Packaging
Customer Reviews	4.2 out of 5 stars 656 Reviews
Data Transfer Rate	5 gigabits_per_second
Enclosure Material	Metal
Form Factor	Mini-ITX
Global Trade Identification Number	00885022016358
Hard Disk Description	DAS (comes unpopulated)
Hard Disk Form Factor	3.5 inches
Hard Disk Interface	Serial ATA
Hardware Connectivity	USB 3.0
Hardware Platform	Mac
Installation Type	Not Specified
Item Type Name	QNAP TR-004 4-Bay USB Type-C Hardware RAID Enclosure/ DAS
Item Weight	4.1 pounds
Manufacturer	QNAP
Media Speed	375 MB/s
Mfr Part Number	TR-004
Model Name	TR-004
Model Number	TR-004-US
Number of Items	1
Read Speed	6 gigabytes_per_second
Special Feature	Compact, fast speed
Specific Uses For Product	business, personal
UPC	885022016358
Unit Count	1 Count
Warranty Description	2 year warranty

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