IBM 45W7766 600GB SAS 10K Hot Swap HDD: Carrier and Tier Guide
Six hundred gigabytes at 10,000 RPM is the least glamorous specification in enterprise storage and quite possibly the most useful. It is the drive that ends up in more server bays than any other, because it is the one that fits the widest range of jobs without compromise in either direction.
The IBM 45W7766 is a 600GB SAS 6Gb/s 10K 2.5-inch drive in a hot-swap carrier for System x servers.
Why 10K is the default rather than a compromise
Storage tiers are usually presented as a ladder, with 15K at the top and nearline at the bottom. That framing is misleading, because the tiers are answers to different questions rather than better and worse versions of the same thing.
15K answers: how do I minimise seek latency? It gives up capacity and power efficiency to do it.
Nearline 7200 answers: how do I store the most data per pound? It gives up seek performance to do it.
10K answers: what if the workload is mixed? Which describes most servers. A virtualisation host runs some latency-sensitive VMs and some idle ones. An application server has hot tables and cold logs. A file server has active projects and dormant archives.
For those, 10K delivers enough IOPS that the storage is not the bottleneck, with enough capacity that you are not filling every bay just to reach a usable volume size. That is why it is the most commonly deployed and most commonly replaced drive class in the category.
45W7766 specifications
| Part Number | 45W7766 |
| Manufacturer | IBM |
| Capacity | 600GB |
| Interface | SAS 6Gb/s |
| Rotational Speed | 10,000 RPM |
| Form Factor | 2.5 inch SFF |
| Carrier Type | Hot-Swap |
| Drive Class | Enterprise Performance |
| Condition | Refurbished, function-tested |
| Warranty | 30-day Tech Seller USA warranty |
Hot-swap: what it actually lets you do
Hot-swap capability is easy to take for granted and worth understanding, because it is the difference between a five-minute fix and a scheduled outage.
A hot-swap tray connects through a backplane that handles power sequencing, so the drive can be removed and replaced while the server is running. The controller expects drives to appear and disappear, and a rebuild begins as soon as the new drive is seated.
The alternative on IBM systems is simple-swap, which connects directly rather than through a hot-swap backplane and requires the server powered down first. On a production system that means an outage window, approvals and a maintenance slot — for a failed drive that is already leaving the array degraded in the meantime.
The two carrier types are not interchangeable. Hot-swap carriers have a lever mechanism; simple-swap carriers do not. Look at the front of the chassis to tell which you have, or read the part number off a fitted drive.
IBM also used G2HS and later G3HS carrier generations, which are again not interchangeable with each other — our G2HS guide covers that distinction.
SKU: 45W7766  | Refurbished & function-tested  | Hot-swap carrier  | 30-day warranty
View Details & Request a Quote →Hot-swap is only useful if a spare is present
Worth stating because it is the gap between having the capability and getting the benefit.
A hot-swap bay lets you replace a drive without downtime. It does not produce a drive. If the array is degraded and the replacement is three days away on a courier, the hot-swap capability has bought you nothing — the array spends three days with no redundancy, every surviving drive under sustained load, waiting for a second failure.
Two mitigations, and most sites should use both. A hot spare configured within the array, which the controller brings in automatically the moment a drive fails, so the rebuild starts unattended. And a cold spare on the shelf, which restores full protection once the hot spare has been consumed.
On IBM System x specifically this matters more than usual, because IBM sold its x86 server business to Lenovo and there is no straightforward parts channel any more. Market availability is the supply, and it does not respond to urgency.
ServeRAID firmware
IBM codes drive firmware and ServeRAID controllers check it. A generic 600GB SAS drive may work while being flagged unsupported, may work without reporting health telemetry so predictive failure warnings never arrive, or may be refused during an array rebuild — the worst case, since that is the moment you depend on it.
For a lab or non-critical system, a generic drive with a scavenged tray is a fair saving. For production, ordering by IBM part number removes the risk for a small difference. See our compatibility guide for IBM carrier types and part numbers.
Ordering
We supply the 45W7766 refurbished and function-tested with a 30-day warranty, single spares or in volume. Send us the part number from a fitted drive if you want the carrier match confirmed first. Browse the full IBM range or our complete enterprise hard drives catalogue.
Common questions
What is the difference between hot-swap and simple-swap?
Hot-swap trays connect through a backplane that handles power sequencing, so a drive can be replaced while the server runs; they have a lever on the carrier. Simple-swap trays connect directly and require the server powered down. The two are not interchangeable.
Why is 10K considered the default tier?
Because most server workloads are mixed. A virtualisation host runs busy and idle VMs; an application server has hot tables and cold logs. 10K gives enough IOPS that storage is not the bottleneck, with enough capacity that you are not filling every bay to reach a usable volume.
Do I need a hot spare if the bays are hot-swap?
Yes. Hot-swap capability lets you replace a drive without downtime, but it does not produce a drive. Without a spare present the array sits degraded waiting for delivery. Configure a hot spare within the array and keep a cold spare on the shelf.
Can I fit a generic SAS drive to a System x server?
A bare drive has no tray, and ServeRAID controllers check firmware — a generic drive may be flagged unsupported, may not report health telemetry, or may be refused during a rebuild. For production arrays, order by IBM part number.
Send us your server machine type and we will confirm the carrier before quoting.
