If your drive is greater than 33.8 Gbytes, your system BIOS may freeze or lockup at Power On Self Test (POST). If the BIOS does not freeze, it may show the wrong capacity for the drive. Similar to the 8.4 Gbyte limit above, there are three methods to overcome this limitation:
A third party device driver such as DiscWizard Starter Edition (DiscWizard Starter Edition is provided on the DiscWizard diskette included with your drive)
An intelligent ATA Host Adapter (e.g., Promise Technology)
A system BIOS upgrade (contact the system BIOS manufacturer)
Reminder: If the system BIOS can display the full capacity of your drive, a FAT32 file allocation system (i.e., Win95 OSR2, Win98, WinMe) or an NTFS file allocation system (e.g., WinNT) is required to show partition sizes over 2.1 Gbytes.
If your drive is larger than 8.4 Gbytes, the capacity may exceed the limits of your system BIOS and operating system. Most system BIOSs cannot support ATA drives this large. DOS and Windows operating systems limit the drive capacity to 8.4 Gbytes per physical drive and 2 Gbytes per partition. Because of these limitations, a 32-bit file allocation table (FAT32) is required to acheive full capacity of your drive, beyond 8.4 Gbytes. To acheive full capacity of your drive, you will need BIOS support for drives greater than 8.4 Gbytes and a Windows operating system that supports FAT32. This support is available by way of the following methods:
A third party device driver, such as DiscWizard Starter Edition (DiscWizard Starter Edition is provided on the DiscWizard diskette included with your drive)
An intelligent ATA Host Adapter
A system BIOS upgrade
Invalid BIOS Information
Some computers have a BIOS that may display invalid information in the CMOS. This issue may show up in one of two ways:
The CMOS will display invalid drive parameters. However, the BIOS is translating the drive correctly.
The CMOS will display the drive parameters and capacity correctly. However, the BIOS is not translating the drive correctly.
To ensure your drive is translated to its full capacity, you will need to check the actual drive size. This can be done when creating partitions on the drive.
6322 Cylinder (3.27-Gbyte) Limitation
Some computers have a BIOS that does not properly handle a cylinder value over 6322. If you are in the CMOS attempting to set the cylinder value higher than 6322 (for a 3.27 Gbyte+ drive) and your computer hangs, your computer may have a BIOS with this limitation. To by pass the limitation, you have two options:
Set the cylinder value to 1024 or less and use Ontrack's DiscWizard Starter Edition to provide support for the whole drive.
Contact your computer manufacturer for a BIOS upgrade
4096 Cylinder (2.1-Gbyte) Limitation
Some computers have a BIOS that does not properly deal with the "13th bit". The 13th bit is needed to provide support for a drive having 4096 or more cylinders. The chart below displays the corresponding cylinder values in decimal, hex, and binary values.
Decimal Hex Binary Size
1023 = 3FF = 10 bits = 528 Mbytes
2047 = 7FF = 11 bits = 1.0 Gbytes
4095 = FFF = 12 bits = 2.1 Gbytes
8191 = 1FFF = 13 bits = 4.2 Gbytes
16383 = 3FFF = 14 bits = 8.4 Gbytes
If you have added a new drive and your system locks right after turning the