1. A data storage drive for providing concurrent read and write access by at least one host to data storable on a removable random access data storage medium; said data comprising a plurality of data segments, at least some of said data segments comprising at least one partition; said removable random access data storage medium accessible at and removable from said data storage drive; comprising: a plurality of logical accessors, each said logical accessor arranged to communicate with said at least one host for read and/or write access to said removable random access data storage medium; a read/write access unit providing read and write access to said removable random access data storage medium; and a read/write control coupled to said plurality of logical accessors and to said read/write access unit, said read/write control: responds to said read and/or write access of one of said logical accessors to one of said partitions, identifying at least one said data segment as comprising said partition for said access; upon occurrence of a write access for at least a data segment of said identified partition by one of said logical accessors, establishes, as a write accessed context, at least said one data segment of said identified partition for said write access, locking said write accessed context to said one of said logical accessors for said write access; operates said read/write access unit to access said write accessed context for said locked write access one of said logical accessors; concurrently operates said read/write access unit to provide read and/or write access to said data of said removable random access data storage medium by other said logical accessors than said locked write access one of said logical accessors; preventing read access to said write accessed context by any logical accessor other than said locked write access one of said logical accessors; and preventing write access to any data of said locked write access partition of said removable random access data storage medium by other than said locked write access one of said logical accessors; and upon completion of said write access by said locked write access one of said logical accessors, releases said locking of said write accessed context to said locked write access one of said logical accessors.