hd space meaning in English

有多少硬盘容量

500 mb hd space
500 mb硬碟可用空间
For instance , more than 100g of hd space is occupied by the measured data of an airplane
例如,一架飞机的测量数据占用硬盘空间100g以上。
But the triangle mesh data measured is massive , and usually up to millions even ten millions of triangular patches , and this occupies too much storage and hd space of computer
然而测量得到的三角网格数据是海量的,经常达到百万甚至上千万个三角面片,大量占用计算机的内存及硬盘资源。