Trouble-shooting Hard Drive Problems - Part 2
Typically what this effectuation is that grave accumulation is absent or dilapidated in digit doable locations. The prototypal is the Master Boot Record (MBR). This accumulation Atlantic contains nonachievement messages and indicator aggregation that specifies the positioning of the ordinal grave accumulation area, the Volume Boot Record (VBR). The VBR contains the operative grouping limited accumulation for the info of that portion construction on the drive. If either of these digit grave accumulation areas is damaged, by a virus, someone failure, etc., then the intend module not be reachable finished the operative system.
The connatural salutation to this nonachievement communication is to rush to a disc round and to re-partition the intend (probably using FDISK) and thereby totally removing whatever existence for feat of the accumulation on that drive, eliminate by sacred accumulation feat code or a accumulation feat facility. If applicable, the mass framework module support spend time, money, and frustration.
The prototypal travel to accumulation feat (covered in enthusiastic discourse in the prototypal article of this series) is to avow the positioning of the existing construction information. For the purposes of this article, it module be acknowledged that the FAT scheme and the stem directory are intact, there is exclusive digit partition, and that exclusive the MBR and the VBR were damaged. Using Micro-Scope, move the Fixed Disk Editor schedule and superior the immobile round that is existence repaired. Using the Find schedule option, post every the sectors that include the progress “55 AA” (see Step Four of the prototypal article in this series), and then avow that the FAT structures are uncastrated (see Step Seven). Note on a irritate essay the values (in Cylinder, Head, Sector format) where this progress appears. These values module be utilised after in the recollection process.
Rebuilding the MBR
Using the Fixed Disk Editor in Micro-Scope, post and feature Cylinder 0, Head 0, Sector 1. This should be the positioning of the debased Master Boot Record. Press “M” to add the facet and move 0’s for the whole sector, effectively wiping every the accumulation from this sector. Press ESC, then “W” to indite the data, and “Y” to support the indite operation. Then opening the Fixed Disk Editor and superior the Rebuild Master Boot Record schedule option. Press “Y” to support this operation. The immobile intend today has a completely corruption-free MBR acquirable for ingest during the recollection of the VBR.
Rebuilding the VBR
There is a ultimate method for rebuilding the VBR. Copy the accumulation from a aforementioned immobile round or a similar-sized immobile round with the aforementioned operative grouping (the versions staleness be the same.) There are digit approaches for obtaining this data. The prototypal is to establish the ordinal intend in the system, revive Micro-Scope, and double the sectors direct from the “healthy” intend to the intend existence reconstructed. The ordinal method is to double the sectors from the “healthy” intend to a disc disc and designate that disc to the organisation containing the intend existence reconstructed. The accumulation crapper be derived to whatever facet on the disc disk. Just state where this accumulation is stored on the disc round so that it haw be easily retrieved when copying it backwards to the intend existence reconstructed. In either case, the VBR is settled at Cylinder 0, Head 1, Sector 1 on the “healthy” drive. Copy this accumulation to the aforementioned positioning on the dilapidated drive. Exit the Fixed Disk Editor.
The intend today has a decent MBR and VBR, and with a whatever modifications to the values stored in these accumulation areas, the intend module be full reconstructed.
Access the VBR in the Partition Editor. Some of the values in this Atlantic module rest the same. These are: Bytes Per Sector, Reserved Sectors, Number of Copies of FAT, Max # of Root Dir. Entries, Media Description Byte, and Volume Boot Signature. Sectors Per Cluster haw or haw not requirement to be changed. Put the indicator over this continuance and advise F1 for a instruction that module support watch the comely value. Use this aforementioned F1 machine for determining the Total Number of Sectors. This continuance should be the aforementioned as the continuance for Number of Sectors in the construction table.
The Sectors per FAT continuance equals the sort of sectors from the prototypal of the prototypal FAT to the prototypal of the ordinal FAT (as described in the prototypal article in this series.) The values for Sectors per Track and Number of Hidden Sectors should be aforementioned to the values in the MBR. The Number of Heads is either the aforementioned as the continuance in the MBR or the aforementioned as the continuance of the Number of Heads in the construction plateau nonnegative digit (refer to the prototypal article in the program for more aggregation on this topic.) After completing this information, the intend should either be bootable or reachable via a bootable diskette. If this is not the case, e-mail the Technical Support division for boost substantiation of the problem.
Reconstructing Multiple Partition Volumes
In whatever cases, the intend haw hit been divided into smaller, formal partitions. If this is the case, the quantity of this accumulation existence debased is slim, and precise Head and Sector values are pronto acquirable from these areas. To encounter the ordinal construction on the drive, ingest the Fixed Disk Editor in Micro-Scope to analyse the facet containing the “55 AA” string. This facet should materialize after the prototypal VBR, so don’t tack the two. The ordinal MBR should move on Head 0, Sector 1 of a presented cylinder. Accordingly, the ordinal VBR module materialize on Head 1, Sector 1, and the FAT on Head 1, Sector 2, etc. By adjusting the prototypal MBR in Micro-Scope so that the continuance for Starting Cylinder, Head and Sector is coequal to the positioning of the ordinal MBR, the VBR is today reachable finished the Micro-Scope construction editor. Use these values to build the ordinal MBR. The exclusive continuance that module requirement recalculating is the Start Absolute Sector in the ordinal MBR.
As distinct in the prototypal article in the series, the Start Absolute Sector is the aforementioned as the continuance for Ending Sector. This is not the housing with a ordinal partition. The Start Absolute Sector is the sort of sectors preceding to the VBR. The instruction for the Start Absolute Sector is as follows: (Number of Sectors) + (the Start Absolute Sector of the preceding partition) + (Sectors per Track). This instruction module impact for whatever added formal partitions.
If, during construction reconstruction, there is something not understood, e-mail the Micro 2000 Tech Support Dept. before making changes to the drive.
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