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You can mount one or more volumes to a sandbox when creating it. The keys of the volumeMounts / volume_mounts object are the mount paths inside the sandbox. 
import { Volume, Sandbox } from 'e2b'

const volume = await Volume.create('my-volume')

// You can pass a Volume object
const sandbox = await Sandbox.create({
  volumeMounts: {
    '/mnt/my-data': volume,
  },
})

// Or pass the volume name directly
const sandbox = await Sandbox.create({
  volumeMounts: {
    '/mnt/my-data': 'my-volume',
  },
})

// Files written to /mnt/my-data inside the sandbox are persisted in the volume
await sandbox.files.write('/mnt/my-data/hello.txt', 'Hello, world!')