Even though hard disks are much cheaper compared to 15 years ago when a 250 Megabyte hard disk cost a couple hundred dollars, adding disk drives still incurs a cost to the organization.

虽然与十五年前相比(那时候一个250 MB的硬盘就要花费200美元)，硬盘的成本降低了很多，但是对于企业来说，增加磁盘驱动器仍然需要一笔不容忽视的成本。

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If you must deal with many-megabyte XML documents, it's often impractical to spend the memory, disk space, and CPU overhead to manipulate such huge documents.

若必须处理许多兆字节的XML文档，花费内存、磁盘空间和CPU开销来操作这么大的文档通常是不实际的。

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The cost per Megabyte of hard disk storage is competitive with magnetic tape if only one tape is used per drive.

硬盘存储的每兆字节成本与磁带不相上下，如果每个驱动器只用一条磁带。

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That made a 100-megabyte Zip disk a useful tool for backing up data and sharing files with other people.

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Indeed, this bargain Zeos comes with a paltry half-megabyte memory and a 42-megabyte hard drive, and lacks a floppy disk drive for the new 3-inch disks.

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The biggest threat to the spinning disk is the flash memory, which has many advantages over the spinning disk but is ten times the price on a per-megabyte basis.

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