A buyer's guide to choosing the right HP or HPE ProLiant drive for your server or storage array — by form factor, drive carrier, interface, and generation.
Last updated: 2026
From time to time, a customer needs guidance on which type of HPE Enterprise hot-plug drive is right for their ProLiant server or storage array. There are more variables today than there used to be — but the decision still comes down to a few simple checks. This guide walks you through all of them in order.
Note: Everything below applies equally to HPE Enterprise SATA hot-plug drives, SAS drives, and 2.5-inch SSDs. Where NVMe drives differ, we call it out separately.
A modern HPE drive has to match your server on four things, and getting any one of them wrong means the drive won't seat, won't be recognized, or won't perform the way you expect:
- Form factor — the physical size of the drive (SFF, LFF, or EDSFF)
- Drive carrier — the tray the drive is mounted in (Legacy, Smart Carrier, or Basic Carrier)
- Interface — how the drive talks to the server (SAS, SATA, or NVMe)
- Server generation — which ProLiant generation you're populating
We'll take each in turn. If you just want the short version, here's the compatibility cheat sheet.
Quick reference: HPE drive carrier compatibility by generation
| Drive carrier | Identifier in product titles | Compatible ProLiant generations |
|---|---|---|
| Legacy (G-series) | (legacy / “G7”) | G7 and older (also G5/G6) |
| Smart Carrier (SmartDrive) | SC | Gen8, Gen9, Gen10 |
| Basic Carrier | BC | Gen10 Plus, Gen11, Gen12 (plus select Gen10 models) |
| EDSFF Thin Carrier (NVMe) | E3.S / EC1 | Gen11 and Gen12 (NVMe SSDs only) |
The single most important takeaway: a Smart Carrier (SC) drive will not work in a Gen10 Plus, Gen11, or Gen12 server, and a Basic Carrier (BC) drive will not work in a Gen8 or Gen9 server. This is the change that trips up the most buyers today, and it didn't exist when most legacy buying habits were formed. More on that below.
Step 1 — Does your server use SFF (2.5") or LFF (3.5") drives?
First, the basics: LFF stands for large form factor (3.5-inch) and SFF stands for small form factor (2.5-inch).
Historically, the “2.5-inch” and “3.5-inch” labels referred to the diameter of the spinning platter inside a mechanical hard drive. Today the names are simply an industry convention for the drive's physical width — a 2.5-inch SSD has no platter at all, but it still uses the SFF housing so it drops into the same bays. The practical point is the same: you need a drive whose housing matches your server's drive bays.
Measure a drive that's already in your server
Since you can't (and shouldn't) open a drive to measure the platter, just measure the width of the bare drive housing. Measure the drive only — don't include the hot-plug tray.
Here are the standard dimensions for each form factor:
- SFF (2.5"): 2.75" W × 0.59" H × 3.945" D (69.85 mm × 15 mm × 100 mm). Enterprise SFF drives are typically 15 mm tall; some SSDs are 7 mm.
- LFF (3.5"): 4.0" W × 1.0" H × 5.75" D (101.6 mm × 26.1 mm × 147 mm)
The 69.85 mm (SFF) versus 101.6 mm (LFF) width is the figure that matters — it's the quickest way to tell the two apart.
No ruler handy? Use the spare part number
Every HPE drive has a spare part number printed on its label. Find the spare number on one of the drives currently in your server, search our site for that number, and the product title and description will tell you whether it's a 2.5" SFF or 3.5" LFF drive. For example, a drive with spare number 508010-001 is a 2 TB 3.5" LFF drive.
A note on EDSFF — the newer NVMe form factor
If you're buying for a Gen11 or Gen12 server and you want flash storage, you'll also see a third option: EDSFF E3.S. EDSFF (Enterprise & Datacenter Standard Form Factor) is a slim, high-density form factor built specifically for NVMe SSDs running on PCIe Gen5. It replaces the traditional 2.5-inch SSD in the newest servers and lets a single chassis pack in far more drives. EDSFF drives are not interchangeable with SFF or LFF bays — your server has to be configured with EDSFF drive cages. If your Gen11/Gen12 server has EDSFF bays, see our HPE EDSFF NVMe SSD selection.
Step 2 — Which drive carrier does your server use?
This is where the most expensive mistakes happen. The carrier (also called the tray or caddy) is the sled the drive is mounted in, and HPE has used three different carrier designs across the ProLiant line.
The three carrier types
Legacy carriers (G7 and older). These are the classic SAS/SATA hot-plug trays used on G5, G6, and G7 servers. Drives for these machines are sold simply as legacy hot-plug drives.
Smart Carrier — “SmartDrive” (SC). In 2012, HPE introduced an advanced hot-plug carrier that became the standard beginning with Gen8 ProLiant servers and continued through Gen9 and Gen10. You can spot a Smart Carrier by its distinctive circular activity ring on the face of the tray and its “Do Not Remove” indicator. Smart Carriers also use HPE's carrier authentication, which verifies that the drive and tray are genuine HPE-qualified parts. In product listings, these drives are marked SC.
Basic Carrier (BC). For the first time in roughly a decade, HPE released a new carrier design that became standard on Gen10 Plus, Gen11, and Gen12 servers (and a small number of later Gen10 models). The Basic Carrier looks similar to the Smart Carrier but uses a simplified faceplate — most noticeably, it drops the spinning activity ring. In product listings, these drives are marked BC.
Why this matters: carriers are not cross-compatible
The carrier change created a hard compatibility line that catches a lot of buyers:
- Smart Carrier (SC) drives do not fit Gen10 Plus, Gen11, or Gen12 servers.
- Basic Carrier (BC) drives do not fit Gen8 or Gen9 servers.
So a drive that worked perfectly in your old Gen9 box will not drop into a new Gen11 chassis, even if the capacity, interface, and form factor are identical. Always confirm the carrier (SC vs. BC) before you buy.
How to identify your carrier
Match it visually. The fastest method is to pull a drive that's already installed in your server and compare it to product photos. If the tray has the round activity ring, it's a Smart Carrier (SC); if the faceplate is simplified with no spinning ring, it's a Basic Carrier (BC).
What if your server has no drives to compare? Many customers buy servers “barebones” and come to us to populate them with drives and memory. In that case, go by the server generation:
- Gen8 / Gen9 / Gen10: Smart Carrier (SC)
- Gen10 Plus / Gen11 / Gen12: Basic Carrier (BC)
If you're unsure of your server's generation, look it up by model, part, or serial number using the HPE PartSurfer tool.
Tip: Need to put a 2.5" SSD into a 3.5" LFF bay? HPE makes a 2.5"-to-3.5" adapter that mounts the smaller drive into an LFF carrier. Just make sure the LFF carrier itself matches your server (SC or BC).
Step 3 — Which interface do you need: SAS, SATA, or NVMe?
Form factor and carrier get the drive into the bay; the interface determines how it communicates and how fast. Modern ProLiant servers support three:
SATA (6 Gb/s). The most cost-effective option, well suited to general-purpose workloads, backups, and bulk capacity. Fine for most everyday storage.
SAS (12 Gb/s / 24 Gb/s). Faster and more robust than SATA, with better support for enterprise features and demanding, data-intensive workloads. The traditional choice for performance-sensitive applications.
NVMe. The highest-performance option, communicating directly over PCIe lanes rather than a storage bus for dramatically lower latency. On Gen11 and Gen12 servers, NVMe comes in two physical flavors: 2.5" U.2/U.3 SSDs and the newer EDSFF E3.S drives described above.
One modern convenience worth knowing about: many Gen11 and Gen12 SFF bays are tri-mode (U.3), meaning a single bay can accept a SAS, SATA, or NVMe drive. This gives you flexibility, but the drive still has to match the carrier and generation rules from Step 2 — tri-mode support doesn't change which carrier you need.
Step 4 — Buy genuine HPE drives (and why it matters)
It's tempting to drop a third-party drive into an HPE bay, and many will physically fit. The problem is that HPE drives carry firmware that the server and HPE iLO management use to authenticate the drive and report detailed health, wear, and predictive-failure data. A non-HPE drive may fit but lose that monitoring, throw “unsupported drive” warnings, or behave unpredictably in an array. For production systems, genuine HPE drives are almost always worth it — and every drive we sell is a genuine HPE Enterprise part.
Step 5 — Now you know what you need. Where to buy?
Use the links below to shop by carrier type and form factor. On each category page, filter by capacity, performance level, speed, and other attributes to narrow your selection.
Legacy-style drives (G7 and older servers)
Smart Carrier / SmartDrive (SC) — Gen8, Gen9, Gen10 servers
Basic Carrier (BC) — Gen10 Plus, Gen11, Gen12 servers
NVMe (EDSFF E3.S) — Gen11 and Gen12 servers
Not sure which generation you have, or want a hand cross-referencing a spare number? Contact us — we'll make sure you get the right drive the first time.
Frequently asked questions
Will a Smart Carrier (SC) drive work in a Gen11 server?
No. Smart Carrier drives are compatible with Gen8, Gen9, and Gen10 servers only. Gen10 Plus, Gen11, and Gen12 servers require Basic Carrier (BC) drives.
What's the difference between a Smart Carrier and a Basic Carrier?
They're two different HPE drive trays. The Smart Carrier (used on Gen8–Gen10) has a circular activity ring and “Do Not Remove” indicator on its faceplate. The Basic Carrier (used on Gen10 Plus, Gen11, and Gen12) uses a simplified faceplate without the spinning ring. They are not cross-compatible between those generations.
How do I tell which HPE ProLiant generation I have?
Check the model name on the server (for example, “DL380 Gen11”), or look the unit up by part or serial number using HPE PartSurfer. Your generation tells you whether you need SC or BC drives.
Do I need SFF, LFF, or EDSFF drives?
SFF (2.5") and LFF (3.5") are the traditional hard-drive and 2.5" SSD sizes and are available across most generations. EDSFF (E3.S) is a newer high-density NVMe SSD form factor used only on Gen11 and Gen12 servers configured with EDSFF drive cages. Match the form factor to the bays your server actually has.
Can I put a 2.5" drive in a 3.5" bay?
Yes, using an HPE 2.5"-to-3.5" adapter that mounts the smaller drive into an LFF carrier. The carrier still has to match your server generation (SC or BC).
Are third-party drives compatible with HPE servers?
Many will physically fit, but they typically lose HPE iLO health monitoring and predictive-failure reporting and may generate “unsupported drive” warnings. For production reliability, genuine HPE drives are strongly recommended.
Have a question we didn't cover? Reach out to our team — we're happy to find you exactly the right HPE drive for your server or storage array.
