HP d248 HP Compaq Business Desktop d200 Series Personal Computers Service Refe - Page 31

Drive Capacities, Microsoft to Drive Manufacturer Size Conversion Table

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Ultra ATA Drive Guidelines and Features 4.5 Drive Capacities The combination of the file system and the operating system used in the computer determines the maximum usable size of a drive partition. A drive partition is the largest segment of a drive that may be properly accessed by the operating system. A single hard drive may therefore be subdivided into a number of unique drive partitions in order to make use of all of its space. The table that follows identifies the capabilities and restrictions imposed on the computer by the combinations of file and operating systems. Microsoft to Drive Manufacturer Size Conversion Table* Drive Size as Identified by Microsoft Operating System Drive Size as Identified by Drive Manufacturers 2 GB 2.1 GB 4 GB 4.3 GB 32 GB 34.4 GB 64 GB 68.7 GB 128 GB 137 GB 2 TB 2.199 TB *Drive size calculations by drive manufacturers are bytes to the base 10 while calculations by Microsoft are bytes to the base 2. Drive/Partition Capacity Limits File System FAT 32 FAT 32 NTFS NTFS Controller Type ATA SCSI ATA SCSI Operating System Windows 2000/ XP Windows 2000/ XP Windows NT/2000/XP Windows NT/2000/XP Maximum Size Partition 32 GB 32 GB 128 GB 2TB Drive 128 GB 2 TB 128 GB 2TB Service Reference Guide, d200 336493-004 4-7

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Service Reference Guide, d200
336493-004
4–7
Ultra ATA Drive Guidelines and Features
4.5 Drive Capacities
The combination of the file system and the operating system used in the computer determines the
maximum usable size of a drive partition. A drive partition is the largest segment of a drive that
may be properly accessed by the operating system. A single hard drive may therefore be
subdivided into a number of unique drive partitions in order to make use of all of its space.
The table that follows identifies the capabilities and restrictions imposed on the computer by the
combinations of file and operating systems.
Microsoft to Drive Manufacturer Size Conversion Table*
Drive Size as Identified by Microsoft
Operating System
Drive Size as Identified by
Drive Manufacturers
2 GB
2.1 GB
4 GB
4.3 GB
32 GB
34.4 GB
64 GB
68.7 GB
128 GB
137 GB
2 TB
2.199 TB
*Drive size calculations by drive manufacturers are bytes to the base 10 while calculations by
Microsoft are bytes to the base 2.
Drive/Partition Capacity Limits
Maximum Size
File
System
Controller
Type
Operating System
Partition
Drive
FAT 32
ATA
Windows 2000/ XP
32 GB
128 GB
FAT 32
SCSI
Windows 2000/ XP
32 GB
2 TB
NTFS
ATA
Windows NT/2000/XP
128 GB
128 GB
NTFS
SCSI
Windows NT/2000/XP
2TB
2TB