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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.

Технические характеристики

Параметр	Спецификация
Емкость	24ТБ (largest in WD Red Pro line)
Фактор формы	3.5-дюйм LFF
Интерфейс	SATA 6 Гбит/с
Скорость вращения	7,200 Rpm
Recording Technology	CMR (ePMR, Energy-Assisted PMR) — no SMR write penalty
Cache Buffer	512 МБ
Sustained Transfer Rate	Вплоть до 288 МБ/с
Average Latency	4.16 ms
Среднее время безотказной работы	2,500,000 часы
Workload Rate Limit	300 TB/year
URE Rate	1 sector per 10^15 bits
Власть (Праздный / Операционная / Standby)	3.9Вт / 6.8Вт / 0.8Вт
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
Размер сектора	512е
Шок (Операционная / Non-Op)	70г / 250г
Физический	147.0 Икс 101.6 Икс 26.1 мм, 690г
Температура	5C to 60C
Гарантия	5-ограничено годом (производитель)

NAS Capacity Planning: What 24TB Drives Unlock

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