East Midlands Ambulance Service NHS Trust has lost a data cartridge which had contained 42,000 copies of patient forms.
Sue Noyes, the chief executive of the service said that the incident had been reported the incident to the Information Commissioner, to Nottinghamshire Police and NHS organisations who monitor and regulate the trust's service.
The cartridge containing just under 42,000 electronic copies of scanned handwritten Patient Report Forms were from September 2012 to November 2012. The cartridge was stored at the Beechdale divisional headquarters in Nottingham.
There was still a possibility that it was on the firm's premises, but there was also a possibly that it had been nicked.
It is an odd thing to steal. The data can only be read using specific hardware that is available on the Trust's premises and which is no longer in production. Noyes said that this meant that the information stored on the missing cartridge could still be viewed by anyone outside of the organisation.
The Trust has asked those people who received an ambulance response and had their details recorded in handwriting between September 2012 and November 2012 to contact the trust if they have any concerns about the news.