This is the 11394th most frequent Russian word.
дисков
The Russian word "дисков" means "disks" (genitive plural form).
In this sentence, 'дисков' refers to physical discs, like CDs or DVDs, and it is in the genitive plural form to denote 'of discs' or 'some discs'.
Я купил несколько новых дисков на прошлой неделе.
I bought several new discs last week.
Here, 'дисков' again refers to discs, specifically music CDs, and is used in the genitive plural form after the word 'выбор' (selection).
В магазине большой выбор музыкальных дисков.
There is a wide selection of music discs in the store.
The word 'дисков' in this context refers to discs contained in boxes, and it is in the genitive plural form to indicate possession within the boxes.