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The 24TB NAS Drive That Makes a 4-Bay Synology a 72TB File Server

A 4-bay NAS with four 24TB drives in SHR (Synology Hybrid RAID) delivers 72 TB of usable capacity with one-drive fault tolerance. For a small business that has outgrown its 12TB NAS, that is a 6x capacity jump without changing the enclosure. The WD Red Pro 24TB is the highest-capacity drive in WD’s NAS lineup, combining 7,200 RPM CMR recording, 2.5 million hours MTBF, 300 TB/year workload rating, and AgileArray firmware optimized for multi-drive RAID environments. It is the drive you put in the NAS that now stores everything because the old NAS was too small.

Spécifications techniques

Paramètre	spécification
Capacité	24TB (largest in WD Red Pro line)
Facteur de forme	3.5-pouce LFF
Interface	SATA 6Gb/s
Vitesse rotationnelle	7,200 RPM
Recording Technology	CMR (ePMR, Energy-Assisted PMR) — no SMR write penalty
Cache Buffer	512 MB
Sustained Transfer Rate	Jusqu'à 288 Mo/s
Average Latency	4.16 MS
MTBF	2,500,000 heures
Workload Rate Limit	300 TB/year
URE Rate	1 sector per 10^15 bits
Pouvoir (Idle / en fonctionnement / Standby)	3.9O / 6.8O / 0.8O
Sealing	Helium-sealed (HelioSeal-derived)
Rotational Vibration	RVFF sensor array — multi-drive RAID optimized
AgileArray	TLER (Error Recovery Control), RAID rebuild optimization, dual-plane balance
Sector Size	512e
Choc (en fonctionnement / Non-Op)	70g / 250g
Physical	147.0 X 101.6 X 26.1 millimètre, 690g
Température	5C to 60C
garantie	5-year limited (fabricant)

NAS Capacity Planning: What 24TB Drives Unlock

NAS Size	Disques	RAID Level	Usable Capacity (24TB drives)	Use Case
4-bay (Synologie DS923+)	4x 24TB	SHR (RAID 5)	72 TB	SMB file server, video archive, backup target
6-bay	6x 24TB	SHR-2 (RAID 6)	96 TB	Department file server, surveillance archive
8-bay	8x 24TB	SHR-2 (RAID 6)	144 TB	Mid-size enterprise, Veeam repository
12-bay	12x 24TB	SHR-2 (RAID 6)	240 TB	Enterprise backup, media archive

Why 24TB — And the RAID 6 Question

At 24TB per drive, RAID rebuild time becomes a serious consideration. A single 24TB drive failure in a RAID 5 array triggers a 30+ hour rebuild. WD Red Pro includes TLER (Time-Limited Error Recovery), which caps drive-level error recovery at 7 seconds so the RAID controller can make the recovery decision instead of the drive hanging indefinitely. For arrays of 24TB drives, RAID 6/SHR-2 (dual parity) is strongly recommended — the probability of a second failure during a 30-hour rebuild is not negligible, and dual parity covers it. The 24TB Red Pro makes sense when you need capacity density per bay; for smaller deployments where rebuild time matters more than capacity, 8-16TB drives remain viable.

Compatible NAS Platforms

Compatible with Synology (DS923+, DS1522+, RS1221+, and higher), QNAP, Asustor, TerraMaster NAS with 3.5-inch SATA bays. Also compatible with TrueNAS, Unraid, Proxmox. SHR-2 recommended for 4+ drive arrays with 24TB drives.