You bought the right drive. It arrived without a tray. Now you are staring at a photo of a caddy on a reseller site trying to work out whether "for Dell PowerEdge" means your PowerEdge.
Drive caddies are the single most common wrong-part order in server spares, because the failure is silent: the part looks right, it is the right size, and it physically slides most of the way into the bay. It just does not seat on the backplane. The rule that governs this is not drive size — it is server generation, and both Dell and HPE changed their caddy design at a specific, identifiable generation boundary.
This is the reference table.
Dell PowerEdge: one boundary, at 14th generation
Dell has exactly one break point that matters. Everything from 11G through 13G shares a caddy family; everything from 14G onward shares a different one. They do not interchange.
| Generation | Example servers | 2.5" SFF caddy | 3.5" LFF caddy |
|---|---|---|---|
| 11G / 12G / 13G | R610, R710, T610, T710 R620, R720, R720xd, R820, T620 R630, R730, R730xd, R830, R930, T630 |
G176J also sold as 0G176J, G281D, KG7NR, WX387, Y961D |
F238F also sold as 0F238F, X968D, G302D, KG1CH |
| 14G / 15G / 16G | R440, R540, R640, R740, R740xd, R940, C6420 R650, R750, R850 R660, R760 |
DXD9H also sold as 0DXD9H |
X7K8W also sold as 0X7K8W |
The practical rule: if your server model number is three digits ending in 0 with a middle digit of 3 or lower (R630, R730), you need G176J/F238F. If the middle digit is 4 or higher (R640, R740, R650, R750, R660, R760), you need DXD9H/X7K8W.
The good news is that Dell has held the 14G caddy design steady across three generations. A DXD9H bought for an R740 will serve an R750 or an R760. That makes it worth standardising your spares pool on the 14G+ parts if your fleet is mixed and modernising.
Two things the caddy does not tell you:
- A caddy is not an interface adapter. The same DXD9H shell carries SAS, SATA and NVMe drives, but the backplane behind the bay decides what will actually enumerate. Putting an NVMe drive in an SAS/SATA bay gets you a drive that spins up and is invisible to the controller.
- A caddy is not a 3.5"-to-2.5" adapter. If you are fitting a 2.5" drive into an LFF chassis, you need the 3.5" caddy plus a 2.5"-to-3.5" hybrid adapter bracket. Buying an X7K8W alone will not do it.
HPE ProLiant: the SmartDrive-to-Basic Carrier break
HPE's boundary is sharper and catches more people out, because it lands in the middle of "Gen10" — the Gen10 and Gen10 Plus are not the same caddy platform, despite the name.
| Carrier type | Generations | Example servers | 2.5" SFF | 3.5" LFF |
|---|---|---|---|---|
| SmartDrive Carrier (SC) | Gen8, Gen9, Gen10 | DL360/DL380 Gen8, Gen9, Gen10 ML350p, DL580, Apollo |
651687-001 | 651314-001 |
| Basic Carrier (BC) | Gen10 Plus, Gen11 | DL360/DL380 Gen10 Plus, Gen11 DL325/DL345/DL365/DL385 Gen10 Plus DL20 Gen10 Plus |
P22892-001 also P22892-002 |
— |
The trap: "Gen10" and "Gen10 Plus" take different caddies. A 651687-001 SmartDrive carrier fits a DL380 Gen10. It does not fit a DL380 Gen10 Plus. The Gen10 Plus moved to the Basic Carrier (P22892-001), and that carrier then continued forward into Gen11. If you are ordering caddies for a "DL380 Gen10 Plus" and you search for "Gen10 caddy", you will get the wrong part every time.
The direction of compatibility is also worth knowing: SmartDrive carriers are backwards-compatible across Gen8/Gen9/Gen10, so a 651687-001 works in all three. Basic Carriers are Gen10 Plus and forward only. There is no carrier that spans both families.
Note also that the SC carrier for Gen10 NVMe drives is a different part again (727695-001) — the standard 651687-001 SAS/SATA carrier and the NVMe carrier are not the same shell on that generation.
How to identify what you have, in 30 seconds
If you have a working server and no documentation, pull one drive and look at the caddy face:
- HPE SmartDrive (SC): distinctive curved/rounded latch with a large illuminated status ring around the drive icon. Feels premium. Gen8–Gen10.
- HPE Basic Carrier (BC): flatter, plainer front, simpler latch, no big status ring. Gen10 Plus / Gen11. The name is literal — it is the cheaper, more basic tray.
- Dell 11G–13G: the older tray, with the release latch on the left and a distinctly boxier profile.
- Dell 14G+: visibly redesigned front face with a broader latch.
Alternatively, the far more reliable method: read your server's Service Tag (Dell) or serial/product number (HPE), confirm the exact model and generation, and order to the table above. Guessing from a photo is how you end up with a box of trays that fit nothing you own. Our Dell, HPE & Cisco part number lookup guide walks through decoding those.
Buy trays with the drives, not after
The most common version of this problem is self-inflicted: someone buys bare enterprise drives on price, then discovers the caddies cost real money and have their own lead time. For a 24-bay populate, the trays are not a rounding error.
Two rules that save money:
Buy the caddy in the same order as the drive. It guarantees the generation match, and it means one shipment and one set of duties rather than two.
Order 5–10% spare trays. Caddy latches are plastic and they break — usually during a hot-swap at 2am by someone in a hurry. A broken latch strands an otherwise perfectly good drive bay, and a tray is far cheaper than an emergency order.
Where to source them
- Drive Caddies & Trays — Dell G176J / F238F / DXD9H / X7K8W, HPE 651687-001 / 651314-001 / P22892-001
- Server & Enterprise Hard Drives — SAS, SATA and nearline, with matching trays
- Solid State Drives (SSD) — enterprise SAS, SATA and NVMe
- Dell Parts and HPE Parts — caddies, backplanes, rails and spares by generation
Working out which drives your chassis actually supports is the other half of this problem — see our Dell PowerEdge hard drive compatibility guide.
Need a quote?
Tell us the server model and how many bays you are populating, and we will quote the drives and the correct trays together — matched to your generation, so nothing arrives that does not fit. We ship worldwide DDP with duties included, accept purchase orders, and return quotes within 24 hours.
Note on part numbers: caddies are sold under multiple interchangeable Dell/HPE part numbers (the "also sold as" entries above are functionally equivalent trays from the same family, and vendors list them inconsistently). Compatibility above reflects the generation boundaries published by Dell and HPE and corroborated across multiple enterprise parts distributors. Chassis configurations vary — particularly on NVMe and hybrid backplanes — so if your build is unusual, confirm against your server's QuickSpecs or send us the Service Tag and we will check it for you.