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HGST Ultrastar 4TB 7.2K SAS 3.5" HDD HUS724040ALS640
Price includes warranty
HGST
Product Specification
| Series | Ultrastar 7K4000 |
| Capacity | 4TB |
| Interface | SAS, dual port |
| Interface Speed | 6Gb/s |
| Form Factor | 3.5-inch (LFF) |
| Drive Type | Hard disk drive (HDD) |
Refurbished Β· Tested
HGST Ultrastar 7K4000 HUS724040ALS640, a 4TB 7,200 RPM 3.5-inch dual-port SAS hard drive for LFF server and storage bays.
The HUS724040ALS640 is a 4TB, 7,200 RPM, 3.5-inch hard drive from HGST's Ultrastar 7K4000 enterprise line, with a dual-port 6Gb/s SAS interface and 64MB cache. It fits servers, storage shelves and enclosures that take large form factor (LFF) drives on a SAS backplane. We supply it refurbished from Doha to system administrators and integrators in Qatar who need to expand array capacity or replace a failed member of an existing RAID set with the same model. The drive is built for capacity-led work where cost per terabyte matters more than random I/O performance: file and backup repositories, archive tiers, video surveillance retention and large RAID 5 or RAID 6 volumes. For databases or busy virtual machine datastores, SSDs or 10K and 15K drives give lower latency, and a common approach is to pair drives like this one with an SSD cache or tier.
HDD-HGST-4TB-7K2-SASSpecification
The interface is 6Gb/s SAS with two independent ports on the connector. On a 12Gb/s SAS controller or backplane the link negotiates down to 6Gb/s, which is not a bottleneck for a 7,200 RPM drive, while other devices on the same controller keep running at 12Gb/s. The SAS connector is keyed so it does not mate with SATA-only ports, so the host needs a SAS HBA, SAS RAID controller or SAS backplane.
Installation
In a hot-swap bay the drive needs the carrier that matches the host server's drive cage, since each server maker uses its own carrier design to seat the drive against the backplane. The bare drive has standard 3.5-inch mounting holes, so fixed internal bays in towers and enclosures take it with screws or rails. With a matching carrier in a hot-swap bay, a failed array member can be pulled and this drive inserted while the server is running, and most RAID controllers then start the rebuild automatically or on command.
When replacing or adding to an array, use SAS drives of at least 4TB with the same 7,200 RPM speed and 512-byte sector size: most controllers size the array on its smallest member, and matched drives avoid performance imbalance during rebuilds. In dual-expander JBODs and dual-controller arrays both SAS ports can be connected for multipath, so access continues if one path fails. On a standard single-path server backplane only one port is used and the drive operates normally.
Part numbers and identification
Condition & testing
- Tested in a compatible system
- Verified against the listed part number and specification
- Fully working; minor cosmetic marks are possible on refurbished units.
- 6-month warranty on every unit we sell, with installation and support across Qatar.
What ships with this part
Images are for illustration. The unit supplied is the one described in the specification and may differ cosmetically.
Our team in Doha answers specification and compatibility questions during working hours.
Ask on WhatsApp sales@serverdove.comCan the HUS724040ALS640 be connected to a SATA controller?
No. This is a SAS drive, and SAS drives need a SAS HBA, SAS RAID controller or SAS backplane. A SATA drive can run on a SAS controller, but the reverse does not work. The SAS connector is keyed so that it does not mate with a standard SATA cable. If your server has SATA-only ports or a SATA-only backplane, choose the SATA version of the drive instead.
Will it work in a 12Gb/s SAS server?
Yes. SAS is backward compatible, so a 6Gb/s drive can be attached to 12Gb/s SAS controllers and backplanes. The link negotiates down to 6Gb/s for this drive, while other devices on the same controller can still run at 12Gb/s. For a 7,200 RPM hard drive, the 6Gb/s link is not a bottleneck, because the drive's sustained transfer rate is well below the interface limit.
What is the difference between HUS724040ALS640 and HUS724040ALE640?
Both are 4TB, 7,200 RPM, 3.5-inch Ultrastar 7K4000 drives. The difference is the interface. The ALS640 is the SAS 6Gb/s model with dual-port support. The ALE640 is the SATA 6Gb/s model. Choose the ALS640 for SAS controllers, multipath enclosures or arrays that already contain SAS drives. Choose the ALE640 for SATA-only systems.
Does this drive need a caddy to fit my server?
In a hot-swap bay, yes. The bare drive has standard 3.5-inch mounting holes, but servers from each manufacturer use their own carrier design to seat the drive against the backplane. You will need the carrier that matches your server model and generation. Fixed internal bays, as in some towers and enclosures, can take the bare drive using screws or rails.
Can I mix this drive with other 4TB drives in a RAID array?
Generally yes, provided the other drives are also SAS and at least 4TB. Most RAID controllers base array size on the smallest member, so mixing capacities wastes the extra space. Matching rotational speed (7,200 RPM) and sector size (512 bytes) avoids performance imbalance and rebuild issues. Some controllers apply vendor-specific drive checks, so consult your controller documentation.
What workloads is a 7,200 RPM SAS drive suited to?
It suits capacity-led workloads with mostly sequential access. Examples include backup repositories, file servers, archive tiers, media storage, surveillance recording and large RAID 5 or RAID 6 volumes. For databases or virtual machine storage with heavy random I/O, SSDs or 10K and 15K drives give lower latency. A common approach is to pair drives like this one with an SSD cache or tier.
What does dual-port SAS mean for this drive?
The drive has two independent SAS ports on its connector. In enclosures and controllers that support multipath, such as dual-expander JBODs or dual-controller arrays, each port can connect to a separate path. Access then continues if one path fails. In a standard single-path server backplane, only one port is used and the drive operates normally.
What does refurbished mean at ServerDove?
Off-lease or decommissioned enterprise hardware that we clean, test and reset in Doha. Every unit goes through POST, burn-in, memory and drive checks and a power-supply check, with firmware and BIOS returned to defaults and drives securely erased.
Can I ask about the exact unit before I buy?
Yes. Message us the SKU on WhatsApp and we will confirm the condition and configuration of the unit in stock, with photos if you want them.
How fast is delivery in Qatar?
Orders ship from Doha and arrive within one working day anywhere in Qatar. Delivery is free on orders over QAR 300.
Can I collect in person?
Yes, from Nuaija Office 7, Doha, usually within 24 hours of ordering. Choose pick-up at checkout and we will message you when it is ready.
What warranty is included?
A 6-month hardware warranty from the delivery date, covering the unit as supplied. If a part fails we repair or replace it. Full terms are on the warranty page.
What is your return policy?
If the unit arrives faulty or not as described, tell us and we will collect it and replace or refund it. Full terms are on the Refund Policy page.
Which payment methods do you accept?
Visa, Mastercard and American Express online. Bank transfer is available for company orders; contact us for details.
Is the price shown the final price?
Yes. The price shown is what you pay; nothing is added at checkout, and every order ships with an invoice in your name or your company's name.
Why buy refurbished
Enterprise hardware, tested in Doha, at a fraction of the price of new
Every unit we sell has already proven itself in a data centre. We test it again, grade it, and back it with a warranty before it leaves our stock.
Tested before it ships
POST, burn-in, memory and power-supply checks on every unit. Anything that fails is repaired or pulled from stock, not sold.
Same performance, lower cost
A Xeon runs the same workloads whether it is new or two years old. Spend the difference on more CPUs, memory or storage.
In stock, not on order
New enterprise hardware can take weeks or months to arrive. Ours is on the shelf in Doha and delivered across Qatar within a day.
Warranty and local support
Every unit is covered. Installation, configuration and hardware support are handled by our own team in Qatar, not a call centre abroad.