HP F1746C - 20GB hard disk drive module - Plugs into module bay as a second hard disk drive - For OmniBook 41xx and 900 Retail
HP F1746B - 12GB hard disk drive module - Plugs into module bay as a second hard disk drive - For OmniBook 41xx and 900 Retail
HP F1628A - 6.4GB hard disk drive - 12.7mm thick (IBM) - Hard drive case/carrier kit not included Retail