Is the memory upgradable?

No it can't. DS220J memory is fixed at 512 MB. Current software upgrade requires a minimum of 1 GB according to Synology's own notes. Avoid this model/brand.

what physical size harddrives can be used?

The hard drive "size" is not the physical size of the drive itself but the diameter of the platter inside the drive. A standard desktop HDD is 5.75" x 4" but has a 3.5" platter inside. Hence the name 3.5" drive even though it is physically much bigger. A notebook HDD measures 4" x 2.75" and referred to as a 2.5" drive.

If single drive is installed initially, then 2nd drive is added later. does raid 1 get configured? or does both drive need to be installed together?

I installed one drive initially, and then added a second drive later. The second drive was automatically added as a Raid 1 drive.

Can it be used as a datastore for esxi or backup VMs?

Technically you can but not recommended. You will likely get terrible performance because the CPU and memory is not designed for this use case. 512MB RAM is very low for a datastore. This model is really geared towards traditional file sharing and media streaming. You want something with higher CPU and read/wrtie caching like the DS218/DS218+.

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DS220j

Product ID: 185803263

Details

Brand
Synology
Color
Enclosure
Compatible Devices
Server
Connectivity Technology
Ethernet
Digital Storage Capacity
32 TB
Hard Disk Description
Mechanical

⚡1.4 GHz Quad-Core Power

🌐1x Gb Ethernet Connectivity

🔒Built-in Advanced Security

€ 2451.17

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Description

🚀 Elevate your data game with Synology DS220j — power, security, and cloud freedom in one sleek box!

MASSIVE STORAGE POTENTIAL - Support up to 32TB of digital storage, giving you the freedom to archive, share, and manage large files without compromise.
ROCK SOLID SECURITY BUILT IN - Protect your valuable data with comprehensive, evolving security protocols designed to keep threats at bay.
EFFORTLESS PRIVATE CLOUD ACCESS - Create your own secure cloud environment, accessible anytime, anywhere—perfect for the modern professional on the go.
PLUG AND PLAY ETHERNET CONNECTIVITY - Seamlessly integrate into your existing network with a reliable 1Gbps Ethernet port for fast, stable data transfers.
QUAD CORE SPEED FOR SEAMLESS MULTITASKING - Experience lightning-fast data handling with a 1.4 GHz Realtek RTD1296 processor that keeps your workflow smooth and efficient.

The Synology DS220j is a compact, metal-encased NAS device powered by a 1.4 GHz quad-core Realtek processor and 512MB RAM. It supports up to 32TB of storage with fast 1Gb Ethernet connectivity, advanced security protocols, and easy private cloud setup—ideal for professionals seeking reliable, secure, and scalable network storage.

Specifications

ASIN	B0855LMP81
Additional Features	Advanced Security Protocols and Power Management Features
Best Sellers Rank	#259 in Network Attached Storage (NAS) Enclosures
Brand	Synology
Built-In Media	Main Unit, Accessory Pack, AC Power Adapter, AC Power Cord, RJ-45 LAN Cable, Quick Installation Guide
Cache Memory Installed Size	512
Color	Enclosure
Compatible Devices	Server
Connectivity Technology	Ethernet
Customer Package Type	Standard Packaging
Customer Reviews	4.5 out of 5 stars 3,341 Reviews
Data Transfer Rate	6 gigabits_per_second
Digital Storage Capacity	32 TB
Enclosure Material	Metal
Form Factor	Compact
Global Trade Identification Number	00846504003440, 04711174723447
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	3.5 inches
Hard Disk Interface	Serial ATA-600
Hard Disk Rotational Speed	0.01 rpm
Hardware Connectivity	Ethernet
Hardware Platform	ARM
Installation Type	Internal Hard Drive
Item Dimensions L x W x Thickness	3.94"L x 3.94"W x 6.5"Th
Item Weight	1.9 pounds
Manufacturer	Synology
Mfr Part Number	DS220j
Model Name	DS220j
Model Number	DS220j
Number of Items	1
Special Feature	Advanced Security Protocols and Power Management Features
Specific Uses For Product	Network Attached Storage
UPC	846504003440
Unit Count	1 Count

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