Can this be used as external storage for cctv(avtech) which has esata slot?

If you can hook up eSATA drives to your CCTV system then this should work in exactly the same way. It is basically like an external storage device without the storage - you just pop an HDD or SSD into the slot.

Does this support smart?

S.M.A.R.T. attributes are built into hard drives themselves - they are accessible when such drives (virtually all modern SATA HDDs) are inserted into this dock.

What are the hard drive sizes it supports?

From the makers own site - Max Drive Capacity Currently tested with up to 4TB 7200 RPM 3.5" hard drives per bay (8TB total) and 2TB 5900 RPM 2.5" hard drives (2TB total)

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StarTech Dual-Bay USB 3.0/eSATA 2.5/3.5in SATA Dock, 5Gbps (SDOCK2U33EB)

Product ID: 52264516

Details

Brand
StarTech
Colour
Black
Hardware interface
USB 3.0
Hardware platform
Universal
Product dimensions
14.2L x 13.2W

⚡5 Gbps USB 3.2 Gen 1 speed

🔄Hot-swappable dual bays

🔧Tool-less, easy drive swapping

1371 kr

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Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Dock, Swap, and Dominate Your Data Workflow!

BUILT TO LAST - Drive bays rated for 15,000 insertion/removal cycles ensure durability that keeps up with your nonstop workflow.
IT PRO TRUSTED - Backed by a 2-year warranty and free lifetime 24/5 multilingual tech support—because your data deserves expert care.
DUAL DRIVE POWERHOUSE - Simultaneously access and hot-swap two 2.5/3.5" SATA HDDs or SSDs with independent eject buttons for ultimate multitasking.
BLAZING FAST TRANSFERS - Experience seamless 5 Gbps data flow via USB 3.2 Gen 1 or eSATA for lightning-quick backups and transfers.
EFFORTLESS TOOL LESS DESIGN - Swap drives in seconds without any tools—perfect for busy pros who demand speed and convenience.

The StarTech Dual-Bay USB 3.0/eSATA SATA Dock (SDOCK2U33EB) is a professional-grade, tool-less hard drive docking station supporting 2.5" and 3.5" SATA HDDs and SSDs. It delivers up to 5 Gbps transfer speeds via USB 3.2 Gen 1 or eSATA, features independent hot-swappable bays with eject buttons, and is rated for 15,000 drive insertions. Designed for IT pros, it includes a 2-year warranty and lifetime 24/5 multilingual support, making it a reliable, high-performance solution for fast data access and backup.

Specifications

ASIN	B00KILQOG0
Best Sellers Rank	28,718 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 37 in Hard Drive Docking Stations
Brand Name	StarTech
Colour	Black
Compatible Devices	Laptop, Desktop
Country of Origin	China
Customer Reviews	4.0 4.0 out of 5 stars (200)
Data Transfer Rate	5 Gigabits Per Second
EU Spare Part Availability Duration	2 Years
Enclosure Material	Plastic
Global Trade Identification Number	00065030855891
Hardware Interface	USB 3.0
Hardware Platform	Universal
Item Dimensions L x W x H	14.2L x 13.2W x 7.1H centimetres
Item Highlight	SATA I/II/III, eSATA host, Hot-swap, Independent eject buttons, Top-loading, Tool-less, 15,000-cycle rated
Item Type Name	computer-drive-enclosures
Item Weight	0.49 Kilograms
Manufacturer	StarTech.com
Manufacturer Part Number	SDOCK2U33EB
Memory Storage Capacity	4 TB
Model Number	SDOCK2U33EB
Network Connectivity Technology	usb
Number of Items	1
Product Warranty	2 Years
Supported Devices Quantity	2
The Standard Size of the Hard Drive or the Bay the Hard Drive Is Compatible With (in inches)	2.5 Inches
UPC	065030855891 012303763193 012300419581 013862113306 133400621213 011411222738 954491413712 723856592665 650308558910 758399107359
Unit Count	1.0 count

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1371 kr

Duties & taxes included

In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Denmark.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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