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

⚡Realtek RTD1619B 4-core CPU

🌐1Gbit LAN port with QuickConnect

💾2-bay HDD slots for up to 36TB

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฿29858

Duties & taxes included

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💼 Own your data, share your world — the smart NAS for the modern professional.

ROBUST DATA PROTECTION - RAID support and snapshot replication safeguard your precious files from loss.
INTUITIVE DSM OS INTERFACE - User-friendly Synology DiskStation Manager makes NAS management a breeze.
SEAMLESS MULTI DEVICE SYNC - Centralize and share data across PCs, smartphones, and USB devices with ease.
EXPANDABLE STORAGE POWERHOUSE - Supports up to 36TB with flexible HDD configurations tailored to your needs.
EFFORTLESS PRIVATE CLOUD ACCESS - Access your personal cloud anytime, anywhere without complex setup.

The Synology DS223j is a beginner-friendly 2-bay NAS designed for personal and home use, featuring a quad-core Realtek CPU, 1GB RAM, and 1Gbit LAN connectivity. It supports up to 36TB of storage, enabling secure, multi-platform access and advanced data protection through RAID and snapshot technologies. With Synology's intuitive DSM OS, it offers seamless file management, backup, and sharing across devices, making it an ideal private cloud solution for professionals seeking reliable, scalable storage.

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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