FMCB vs FHDB: Memory Card Boot vs Hard Drive Boot
FreeMCBoot (FMCB) and Free Hard Drive Boot (FHDB) are the same softmod idea in two different homes. The direct answer is this: FMCB lives on a memory card and boots from that card, while FHDB lives on an internal hard drive in a Fat PlayStation 2 and boots from that drive. FHDB is only an option for Fat consoles with a network adapter, because Slim consoles have no internal drive bay. If you have a Fat console and a large library, FHDB is worth considering; if you have a Slim, or you want the simplest setup, FMCB on a card is the route, and FHDB is not available to you at all.
Both are part of the same project lineage. FMCB was created by Neme and jimmikaelkael and maintained by SP193 through the 1.9 series, with v1.966 (2019-04-13) as the latest stable release. FHDB is not a different exploit or a competing product. It is FMCB installed to a hard drive instead of a card, using the same installer family, for consoles that can connect a drive. Understanding that relationship prevents a common confusion: you do not choose between two unrelated softmods, you choose where the softmod lives.
How each one boots
With FMCB, the console reads the custom menu from the memory card at power-on. Remove the card and the console returns to its standard browser. The card is small, portable between consoles where the install type allows it, and easy to replace. The limitation is that the card is also the thing you must protect: lose it, corrupt it, or fill it carelessly, and the softmod menu goes with it.
With FHDB, the console boots from the internal hard drive through the network adapter. The drive holds both the boot files and, typically, the game library loaded through Open PS2 Loader (OPL). The advantage is integration: one drive holds the system and the games, and you do not occupy a memory card slot with system files. The limitation is that the setup is tied to that console and that drive. Move the drive to another console without planning and the result is not assured, and a drive failure affects both the softmod and the library at once.
Requirements compared
| FMCB | FHDB | |
|---|---|---|
| Console | Fat or Slim, in a direct-boot group | Fat only |
| Storage for the softmod | A memory card, ideally a Sony 8MB card | An internal hard drive |
| Extra hardware | None beyond the card and an entry point for the first install | A network adapter for the Fat console, plus a drive |
| Game loading | USB, network share, hard drive via OPL, or MX4SIO | Primarily the internal drive via OPL, with other routes still available |
| Portability | Card can move between consoles where the install type allows | Drive is tied to the console and adapter setup |
| If the storage fails | You lose the menu until you reinstall on another card | You lose the menu and the library on that drive until restored |
The network adapter deserves a note. Fat consoles need it for FHDB, and it is also the part that connects the drive physically. Original adapters and modern SATA-conversion adapters both exist, and the choice affects which drives you can use comfortably. If you need an adapter for a Fat setup, a PS2 network adapter is the component to research first, before buying a drive, because the adapter determines the drive interface. Second-hand original adapters are also commonly found through eBay network adapter listings, where condition and included parts vary and should be checked.
Capacity and the caveat to know
FHDB supports drives up to 2TB, but with an important qualification: if the hard drive operating system on the console has not been updated with a replacement module, the supported size is much smaller, around 137GB. That caveat is easy to miss in summaries that simply say “up to 2TB”, and it is the reason some FHDB setups see only part of a large drive. Before buying a large drive for FHDB, confirm which situation your setup is in, because the answer changes what you should buy. A hard drive for a Fat PS2 setup should be chosen after the adapter and the drive-system situation are settled, not before.
FMCB has no equivalent capacity question, because the card holds only the system files and the library lives elsewhere. USB drives, network shares, and MX4SIO cards each have their own practical limits, compared in OPL Loading Compared: USB vs SMB vs HDD vs MX4SIO. In that sense FMCB is more modular: you can change the library storage without touching the softmod, and change the softmod card without touching the library.
Which should you choose?
Choose FMCB on a card if: you have a Slim, you want the simplest install, you want to move the softmod between consoles, or you want library storage that can change independently of the softmod. This is the default recommendation for most people, and it is the only option of the two for Slim owners.
Choose FHDB if: you have a Fat console, you already have or plan to buy a network adapter and a drive, and you want a single-drive setup where the console boots from the drive and the library lives on the same drive. FHDB is at its best as a dedicated Fat-console library machine, not as a casual experiment.
Consider both if: you have a Fat console and want a fallback. An FMCB card plus an FHDB drive gives you two ways into homebrew on the same console, so a problem with one does not leave you without the other. This is more setup work, but for a console you use regularly, the redundancy is genuinely useful.
One caution applies to both routes: neither FMCB nor FHDB alone adds import-disc support or changes how the console treats original discs from other regions. That limit is explained in What FreeMCBoot Cannot Do, and it is unaffected by where the softmod lives.
Checklist
- Confirm the console is a Fat if you are considering FHDB; Slim consoles cannot use it.
- For FHDB, settle the network adapter first, then the drive, then the capacity caveat.
- For FMCB, use a dedicated Sony 8MB card and keep saves on a second card.
- Decide where the library will live, because that choice matters more day to day than where the softmod lives.
- Get the v1.966 package from /download/ and install for the console you will actually use.
FAQ
Is FHDB a newer or better version of FMCB? No. FHDB is FMCB installed to a hard drive instead of a card. It is a different home for the same softmod idea, not a successor version.
Can I use FHDB on a Slim PS2? No. Slim consoles have no internal drive bay, so FHDB is a Fat-only option.
Do I still need a memory card if I use FHDB? Not for booting, since the drive holds the boot files. You will still want a card for game saves, which is a separate job from booting.
What happens if my FHDB drive fails? You lose both the boot files and the library on that drive until you restore them. That is why backups of your own dumps and saves matter, and why some Fat owners keep an FMCB card as a fallback.
Can I switch from FMCB to FHDB later? Yes, on a Fat console. The two routes are not exclusive, and many Fat owners run an FMCB card alongside an FHDB drive so that either route can reach homebrew.
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