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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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Some old BIOS are unable to recognize the full capacity of a new larger HDD and it can only address a part of the drive. You are probably using a 32-Bit host PC. Systems with an LBA length of 32 Bit only support storage capacities up to 2.2 TB. Toshiba recommend that you contact your PC manufacturer and get new BIOS that support your larger HDD. Please refer to the information on the document linked here (50KB).
If this is not the reason but the usable size is just a bit smaller than expected, this issue is probably due to different ways of calculating the size, either using the decimal or a binary system:
In a decimal system 1GB = 1,000MB = 1,000,000KB = 1,000,000,000Byte. But most operating systems calculate with factor 1024 instead of 1000: 1GB = 1024MB = 1024x1024KB = 1,073,741,824Byte. Because of this, all drives seem to be reduced about 7 percents smaller under the operating system than they really are.