
die Disk
club
Colloquial short form for 'Diskothek' (nightclub); a venue where people can dance to music.
Treffen wir uns heute Abend in der neuen Disk in der Stadt?
Shall we meet this evening at the new club in town?
club / disk
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club
Colloquial short form for 'Diskothek' (nightclub); a venue where people can dance to music.
Treffen wir uns heute Abend in der neuen Disk in der Stadt?
Shall we meet this evening at the new club in town?

disk
Outdated, colloquial short form for 'Diskette' (floppy disk); a magnetic data storage medium.
Ich habe die alten Dateien noch irgendwo auf einer Disk gespeichert.
I still have the old files saved somewhere on a disk.
'Disk' is a colloquial short form. Depending on the context, it stands for 'die Diskothek' (nightclub, a place for dancing) or for 'die Diskette' (floppy disk, an old data storage medium).
Früher hat man Daten auf einer Disk gespeichert, heute nutzt man USB-Sticks.
In the past, people saved data on a disk; today they use USB sticks.
The word 'Disk' is colloquial in both meanings. The meaning 'Diskette' (floppy disk) is outdated today, since the technology is hardly used anymore. The meaning 'Diskothek' (nightclub) is still common.
Mein erster Computer hatte noch ein Laufwerk für eine Disk.
My first computer still had a drive for a disk.
When 'Disk' stands for 'Diskothek' (nightclub), it is often combined with verbs of movement or activity. Typical phrases are 'in die Disk gehen' (to go to the club), 'in der Disk tanzen' (to dance at the club), or 'sich vor der Disk treffen' (to meet in front of the club).
Wir gehen am Samstagabend mit Freunden in die Disk.
We're going to the club with friends on Saturday evening.
club
Club and Disk can both refer to a venue for dancing. However, Disk is a colloquial short form of Diskothek, while Club is not such a shortened form. Club fits well in a neutrally worded notice; Disk can be used in a casual conversation.

Ein Freund fragt mich, ob wir um 22 Uhr in die Disk gehen.
A friend asks me whether we’re going to the club at 10 p.m.
Auf der Internetseite steht, dass der Club um 22 Uhr öffnet.
The website says that the club opens at 10 p.m.