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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Synology NAS Kit 2 Bay DS223j Quad Core CPU 1GB Memory Designed for Light Users Domestic Regular Distributor Field Lake Handled Item Phone Support Compatible DiskStation

Product ID: 729567595

Details

サイズ
165 mm x 100 x
ブランド
Synology
商品の寸法
226奥行き x 100幅
対応デバイス
デスクトップパソコン
色
ホワイト

🌐1Gbps LAN port for fast network access

💾2-Bay storage supporting up to 36TB

🧠Quad-Core CPU for smooth multitasking

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₨9859

Duties & taxes included

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your digital life with Synology DS223j — your gateway to secure, smart storage!

ROBUST DATA PROTECTION - Advanced snapshot and backup tools shield your data from ransomware and accidental loss.
SMART MEDIA MANAGEMENT - Organize photos and videos effortlessly with Synology Photos’ intelligent sorting features.
SEAMLESS MULTI DEVICE SYNC - Sync and share files across PCs, smartphones, and USB devices to keep your team or family connected.
MASSIVE STORAGE MINIMAL FUSS - Supports up to 36TB across two bays, perfect for managing all your files and media in one place.
EFFORTLESS PRIVATE CLOUD ACCESS - Access your personal cloud anytime, anywhere with QuickConnect—no complex setup needed.

The Synology NAS Kit DS223j is a beginner-friendly 2-bay network storage solution powered by a quad-core Realtek CPU and 1GB RAM. Designed for light users and small groups, it supports up to 36TB of storage, offers 1Gbps LAN connectivity, and features Synology’s intuitive DiskStation Manager for seamless file sharing, remote access, and robust data protection. Ideal for personal cloud setups, multi-device synchronization, and smart media organization.

Specifications

ASIN	B0C8814GKB
Amazon 売れ筋ランキング	パソコン・周辺機器 - 37,785位 ( パソコン・周辺機器の売れ筋ランキングを見る ) ネットワーク接続ストレージ（NAS）エンクロージャ - 29位
GTIN (Global Trade Identification Number)	00846504004768
UPC	846504004768
おすすめ度	4.5 5つ星のうち4.5 (802) var
カラー	ホワイト
サイズ	165 mm x 100 mm x 225.5 mm
ブランド名	Synology
メーカー名	Synology
メーカー型番	DS223j
レンズマウントの種類	テーブルトップ
互換デバイス	デスクトップパソコン
保証内容	２年間
品目の寸法（D x W x H）	226奥行き x 100幅 x 165高さ cm
商品の重量	0.87 キログラム
型番	DS223j
組み立て式	はい

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