The pressure differential between the drive and the atmosphere isn't going to be that great, if any, so it's pretty unlikely that a leak will occur. If the Hel

The pressure differential between the drive and the atmosphere isn't going to be that great, if any, so it's pretty unlikely that a leak will occur. If the Helium were to leak out then the drive would probably fail much more quickly than it otherwise would have but there isn't nearly enough helium to affect any MEMS devices. Also consider that these drives are going to be in a system with forced air cooling so any Helium that might escape will be quickly vented. Additionally, MEMS devices don't fail but rather behave differently while under the influence of helium.