While still worth $5.9 billion, external storage systems revenue fell by 1.4 percent in the second quarter of this year, according to IDC.
The market research company said a decline in high end systems was coupled with a drop in midrange storage sales too.
While EMC stayed in first place, its market share fell in the quarter from 31.2 percent the year before to 30.1 percent. NetApp and IBM tied in second place but they also saw drops in their sale.
HP appears to have profited from their market share drop, as it moved to fourth place, while Dell and Hitachi tied for the fifth position.
Moving from external disk storage to the total storage market the top four vendors were EMC, HP, IBM and Dell.
