There seems to be no option for spare sectors at least I could not find them. The BE BTH fortunately supports head mapping for drives with more than MB storage space even though the manual says it doesn’t. Hard disk drive manufacturers. When your hardware allows non-standard strappings, you can use these with FreeBSD as long as you enter the correct info into the kernel config file. For that reason the low-level-format should be done from within a suitable Compaq machine.

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Stay away from low-level format programs that mark every sector of a track as bad when they find a flaw on the track.

Give it a try or get another more capable controller. To solve this problem, FreeBSD use the bad tool. For a standard verify after low-level-format use the fdformat. Spare sectoring reduces the sector per track count by 1 or more sectors. Any hope of substituting larger drives for this machine, and if so, what’s the point at which it will freak out over translation issues and require exquisitely unique device drivers to step in front of the operating system and hide the messiness?

Comparison of disc image software.

Hard disk drive interface

The disks have to be jumpered for 34 sectors per track hard sector mode only. And finally all information at a glance: As you can imagine, the limit is quickly reached when the low-level format is done this way.


In case a file is to large for a single track, parts of it may be stored on the same cylinder but on a different platter of the hard drive. This page was last edited on 1 Novemberat The sectors-per- track translation mode lowers the cylinder count under which is the highest cylinder count DOS can address and increases the head count up to 16 heads max.

The PME is a disk coprocessor board. The second cable is a a 20 pin flat cable edge connector that carries the data to and from the drive.

Enhanced Small Device Interface (ESDI)

The defect management and interleave setting is handled by the bridge controller card without user intervention. It’s possible to enter these values in the user defined drive type in the system BIOS.

Spare sectors are used to map sectors, which are located in defect areas, leaving the user with an error free drive. It proved to work well except that it only used 35 sectors on each track. Views Read Edit View history.

For instance, I own a Mb drive that has 54 sectors per track. Some 32Bit operating systems like NetWare or certain Unix systems have less problems with this barrier.

In that case controllwr an alternate address e.


You may click the image to magnify. When your hardware allows non-standard strappings, you can use these with FreeBSD as long as you enter the correct info into the kernel config file. In most cases the remapping is done by using N-1 sectors on each track for actual data storage, and sector N itself is the spare sector.

Forcing the card to accept hard sectored 10MHz or 15MHz drives with a higher sector count by placing a jumper at location W5, will degrade performance. There is no advanced defect management like sector sparing. It operates hard sectored drives up to 36 sectors per track.

The ceramic shield has been obsolete on the new redesigned MFM adapter for Mod.

Going out-of-spec like in the example might or might not work. The drive setup process is done from within the system setup.

Enhanced Small Disk Interface – Wikipedia

No other operating system was present on the disk. Mainstream ESDI drives use 34 to 36 sectors per track. This is compatibility feature?