The last check before the gig
Check your stick,
before the CDJ does.
No time for a test run on a CDJ before the gig? USB-Check checks your rekordbox export in minutes — so you know the stick works before you play.
The last check before the gig
No time for a test run on a CDJ before the gig? USB-Check checks your rekordbox export in minutes — so you know the stick works before you play.
of all software-side failure causes detected
before your stick leaves the house.
Here's how a check runs — from plugging in to peace of mind. Fully automatic.
USB-Check
ready
Not just whether the stick is readable — but whether every single track plays at the club.
FAT32 or exFAT, MBR or GUID — the most common reason a stick isn't recognized at all.
Playlists, cues, and entries pointing to missing files.
Codec, sample rate and bit depth from the header, then fully decoded.
Path lengths, folder depth, and characters that don't survive FAT32.
Reported vs. actual capacity — fake sticks get caught.
Different players, different limits. USB-Check knows them all.
no FLAC, no ALAC
No FLAC or ALAC. The stick has to be FAT-formatted.
no FLAC, no ALAC
Reads HFS+, but not exFAT.
FLAC & ALAC up to 96 kHz
FLAC and ALAC from this model on. exFAT is still not supported.
FLAC & ALAC up to 48 kHz
Reads FAT, FAT32 and HFS+, but not exFAT.
FLAC & ALAC up to 96 kHz
Reads FAT32, HFS+ and, with current firmware, exFAT.
FLAC & ALAC · OneLibrary
Reads exFAT, but only OneLibrary. The stick needs an export from rekordbox 7.2.11 or newer.
FLAC & ALAC · OneLibrary
The compact sibling of the CDJ-3000X: exFAT yes, but OneLibrary only.
Peace of mind for every gig
No credit card required
No — that's exactly what USB-Check is for. The app checks everything a CDJ checks when reading the stick, just beforehand and comfortably on your Mac.
Currently supported models: CDJ-2000, CDJ-2000nexus, CDJ-2000NXS2, XDJ-1000MK2, CDJ-3000, CDJ-3000X, CDJ-1500X.
No. USB-Check specifically checks the exports rekordbox writes to your USB stick. If you use different software, there's nothing for USB-Check to check.
The quick check takes 1–3 minutes, the standard check 5–10 minutes — depending on the size and quality of your stick.
Yes. We've put a lot of time into developing and verifying the check mechanisms. If your USB stick is recognized by your Mac, you can rule out a hardware defect. USB-Check handles the rest. What can't be checked: the firmware version of the CDJ at the club, loose connections and faulty USB ports, and the lifespan of your USB stick.
Yes. After the one-time activation, the app runs locally
Yes. More ideas will be implemented in the future. Please be a little patient here.
USB-Check shows you a banner as soon as a new version is available. You can then download and install the update.
No. The app works exclusively on macOS. Signed and verified by Apple.
If nothing has changed on the stick since the last check, it won't be checked again. You're taken straight to the results of the last check, saving valuable time. Perfect if you want to check multiple sticks.
Yes. You can deactivate the license yourself in the app on the old Mac, then activate it on the new one — done.