Lenovo 4XB0G88761 2TB SATA Nearline HDD: LFF vs SFF Explained
Lenovo ThinkSystem and IBM System x servers are usually configured with small-form-factor performance drives. So a 3.5-inch nearline drive with a Lenovo part number raises a reasonable question: which chassis is this for?
The Lenovo 4XB0G88761 is a 2TB SATA 6Gb/s 7200RPM 3.5-inch nearline drive, and it belongs in the large-form-factor chassis variants that get specified when capacity matters more than IOPS.
LFF and SFF are different servers, not options
This is the part that catches people. A server model is not one chassis with a choice of drive size — the LFF and SFF variants are physically different machines with different backplanes, different bay layouts and different drive counts.
A 2U SFF chassis typically offers around twenty-four 2.5-inch bays. The equivalent LFF chassis offers roughly twelve 3.5-inch bays. Fewer bays, but each holding far more capacity.
You cannot convert one to the other. The backplane connectors are positioned for one drive size, and a 3.5-inch drive will not physically enter an SFF bay regardless of adapters.
The practical consequence when ordering spares: knowing you have a ThinkSystem or System x server is not enough information. You need to know whether the chassis is the LFF or SFF variant, and the easiest way to establish that is to look at the front of the machine or read the part number off a fitted drive.
4XB0G88761 specifications
| Part Number | 4XB0G88761 |
| Manufacturer | Lenovo |
| Capacity | 2TB |
| Interface | SATA 6Gb/s |
| Rotational Speed | 7200 RPM |
| Form Factor | 3.5 inch LFF |
| Carrier Type | Hot-Swap |
| Drive Class | Nearline |
| Condition | Refurbished, function-tested |
| Warranty | 30-day TechSellerUSA warranty |
Why an LFF server exists at all
If SFF gives you twice the bays and better IOPS density, why would anyone specify LFF?
Because for capacity workloads the maths runs the other way. Twelve 3.5-inch drives at high capacity hold far more than twenty-four small-form-factor drives, and cost considerably less per terabyte doing it. Large-format nearline drives reach capacities that SFF drives simply do not.
The roles that justify an LFF chassis are the ones where sequential throughput and terabytes matter and random IOPS do not: backup targets, archive volumes, surveillance recording, media storage, and file servers holding data that is stored more often than it is read.
For those, an LFF server is cheaper per terabyte, uses fewer rack units for the same capacity, and draws less power than the SFF equivalent would need to match it. That is the whole case, and it is a good one.
SKU: 4XB0G88761  | Refurbished & function-tested  | Hot-swap carrier  | 30-day warranty
View Details & Request a Quote →Carrier generations across the IBM to Lenovo transition
Lenovo acquired IBM’s x86 server business, which is why ThinkSystem and System x share so much engineering and why the drive ranges overlap. A server bought as a System x may take drives listed under either brand depending on when it was configured.
The trap is the carrier. IBM used G2HS trays, superseded by G3HS in the later IBM and early Lenovo era, and neither is interchangeable with the other. There is also the simple-swap carrier type on some System x models, which has no lever and requires the server powered down.
Because the part number encodes drive, carrier and firmware together, the reliable approach is always the same: pull a drive currently in the chassis and order against its part number. Working from the server model alone is where mismatches come from.
Our compatibility guide lists Lenovo and IBM carrier types side by side, and the G2HS guide covers that generation specifically.
SATA on a nearline drive in a server chassis
This is SATA rather than SAS, which is the normal and correct choice for a capacity tier.
Nearline workloads are sequential — backup streams, archive writes, media files — and do not generate the deep concurrent command queues SAS is built to handle. Paying the SAS premium buys capability the workload never uses.
SAS becomes worth it where you have redundant controllers needing dual-port paths, or where the backplane is SAS-only and will not accept SATA at all. Some enterprise chassis are exactly that, which is why NL-SAS drives exist. Check what the backplane requires rather than assuming SATA will be accepted.
Ordering
We supply the 4XB0G88761 refurbished and function-tested with a 30-day warranty, single spares or in volume. Send us the part number from a fitted drive and we will confirm the carrier and form factor match before you order. Browse the full Lenovo range or our complete enterprise hard drives catalogue.
Common questions
Can I fit a 3.5-inch drive in an SFF server?
No. LFF and SFF chassis variants are physically different machines with different backplanes and bay layouts. A 3.5-inch drive will not enter a 2.5-inch bay regardless of adapters, and the backplane connectors are positioned for one drive size.
Why choose an LFF server over SFF?
For capacity workloads. Twelve high-capacity 3.5-inch drives hold far more than twenty-four small-form-factor drives and cost less per terabyte, using fewer rack units and less power. It suits backup, archive, surveillance and media storage.
Should I search under IBM or Lenovo part numbers?
Possibly both. Lenovo acquired IBM’s x86 server business so the ranges overlap, and a System x server may take drives listed under either brand. Identify the part number from a drive currently fitted rather than working from the server model.
Will a SATA drive work in my server chassis?
Usually, but not always. Some enterprise backplanes accept SAS only and will not recognise a SATA drive at all. Where that is the case, NL-SAS is the capacity option. Check the backplane requirement rather than assuming.
Send us the part number from a fitted drive and we will confirm form factor and carrier before quoting.
