Category: hard disk

OUR SATA DISKS

SATA disks were introduced in 2005 with the Intel D915PGN desktop motherboard. SATA use 7 data pins while SAS use 14 data pins. Both use 15 power pins. The SFF-8482 connector makes it possible to connect disks to a backplane to simplify replacement. SATA DISK RELIABILITY OPERATING HOURS Remember there are 8,760 hours in a …

Continue reading

MAXTOR 7540AV

The Maxtor 7540AV is a large capacity 540MB hard disk. The 7540AV is slightly larger than DOS  could manage with on 8088 or 80286 based machines. Maxtor also had larger SCSI disks up to 1.2GB but they were very expensive and DOS limitations reduced their appeal. This disk was $550 new in Q1 1994. 540MB …

Continue reading

QUANTUM PRODRIVE LPS52AT

Jumper Position Operational Mode DS SP On Off Single Drive configuration On On Master Drive Off Off Slave Drive Off On Self Seek test selected 52MB 751 cylinders 8 heads 17 sectors 751 landing zone 3600rpm 65535 write precompensation* The LPS52AT (950-5-9105) does not requires write precompensation. Its supported for BIOS compatibility reasons. When we acquired …

Continue reading

FIX HARD DISK CLICKING

First off you should own lots of disks so that redundant copies of important data does not get lost. This guide is not an easy solution and a disk may be wiped when repaired. The clicking sound is generally caused by a faulty logic board. Replacing the logic board requires the exact make and model disk …

Continue reading

FAILED HARD DISKS

Every data center has had it fair share of disk failures. So far we have experienced very few disk failures. Clicking sounds, for example, indicate that the head is seeking back and forth and the disk does not present to the BIOS etc. We experienced 2 failures with 500GB disks arising from changes in soldering. The …

Continue reading

OUR EIDE DISKS

ATA disks, later called EIDE, were introduced in 1985 with a lower cost controller board. The control logic was moved to logic board on the disk assembly which free manufacturers to design new products more easily. The 40-pin cable was eventually replaced with an 8-conductor wire to allow for higher speeds. EIDE hard disks are …

Continue reading

BAD SECTORS

dec_rd54a_bad_sector_map_700

In the early days of hard disks, manufacturers placed bad sector tables on the labels of the disks. This was done so that manual marking of bad sectors could be done. The image shows an old MFM  hard disk with its defect table. This was typical of early hard disks. MS-DOS formats disks completely and …

Continue reading

HARD DISK SURVIVAL

Almost everyone has had disk errors at one time or another. There are the file system errors but this page is concerned with mechanical failures of hard disks. We purchase hard disks frequently primarily to take advantage of capacity increases. The photo is the ST-506 5MB hard disk ($1,500) that was the less expensive of …

Continue reading

RODIME RO352

The Rodime RO352 is he first hard disk available in the 3½” format. This disk cost $1,895 when new in 1983. 11MB ST506 interface 306 cylinders 4 heads 17 sectors 306 landing zone type 02 3600rpm The Rodime RO0352  is a MFM hard disk in the 3½” format . There are two models in the series, RO351 and …

Continue reading

HARD DISK LIMITS

One of the most frustrating problems a lot of DIY enthusiasts came up against was BIOS problems that prevented the use of larger capacity disks. In the early days, DOS version 1 which came on a floppy with our original PC could not even use directories. All saved files had to be saved in the …

Continue reading