hard disk
US /ˌhɑːrd ˈdɪsk/
UK /ˌhɑːrd ˈdɪsk/

1.
disco rígido, HD
a high-capacity, self-contained data storage device containing a read-write mechanism and one or more platters, used in computers.
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I need to replace the hard disk in my old computer.
Preciso substituir o disco rígido do meu computador antigo.
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All your files are stored on the hard disk.
Todos os seus arquivos estão armazenados no disco rígido.