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3.775 bytes |
Service Hints & Tips |
Document ID: GSMH-399DUC |
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This document is provided to IBM and our Business Partners to help sell and/or service IBM products. It is not to be distributed beyond that audience or used for any other purpose. |
IBM PC Server/IBM PS/2 - CHKDSK does not identify usable fixed disk space
Applicable to: World-Wide
Service Information:
In certain situations, hardfiles have been mistakenly replaced due to a perceived shortage of total hardfile space. For example: The 320 MB SCSI hardfile has 625,365 user sectors or 320,186,880 bytes which is the total hardfile capacity, but it is not what the user will see when using CHKDSK.
CHKDSK will only report the capacity for a logical drive. If IML is loaded and/or the drive is divided into multiple partitions, the available space will be further reduced. CHKDSK does not report space taken up by partition tables, FAT(s) and/or the directories used by the operating system.
Note :
Hardfile space depends upon what software is loaded!
Hardfile space available to the user will also depend on the type and version of the specific operating system. The operating system will store its FAT (or HPFS) and directories, which also take up space. The amount of space taken by the FAT and directories will vary depending on the number of partitions. The capacity of the hardfile never changes due to defects. There are enough spare sectors, "ABOVE" the 625,365 user sectors, or 320 MB, to map out any defects that would be found during the normal life of the hardfile. User sectors that are identified as defective will be replaced with these spare sectors so that the capacity of the hardfile will not vary. These principles can be applied to other SCSI and ESDI drives.
In summary, hardfiles should only be replaced when called out by Advanced Diagnostics and/or MAPs located in the HMS.
SAS KEYWORDS:
PSY2 D/T8525 D/T8530 D/T8540
D/T8560 D/T8565 D/T8535 D/T8590
D/T8595 D/T8570 D/T8580 D/T9585
FORMAT DASD SCSI D/T9576
D/T9577 D/T9556 D/T9557 PSY2FDSK
D/T9595 DASD PCOM PCOMFDSK
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Search Keywords |
DASD, DOS, Miscellaneous, SCSI | |
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Hint Category |
Retain, Hard Drives | |
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Date Created |
24-02-92 | |
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Last Updated |
24-11-98 | |
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Revision Date |
19-11-99 | |
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Brand |
IBM PC | |
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Product Family |
PS/2 | |
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Machine Type |
8530, 8535, 8540, 8550, 8555, 8556, 8557, 8560, 8565, 8570, 8573, 8580, 8590, 8595, 9533, 9553, 9556, 9557, 9576, 9577 | |
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Model |
Various | |
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TypeModel |
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Retain Tip (if applicable) |
H096476 | |
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Reverse Doclinks |