Category: server

SIL3114 4-PORT PCI RAID

PCI 3.3V and 5.0V universal SATA 150MB/s 4 SATA channels 266MB/s PCI bandwidth BIOS (EEPROM) RAID 0, 1, 5, 0+1, JBOD 48-bit LBA ATAPI CD/DVD/BD support Plug & Play Any machine with SATA ports on the motherboard have PCI 2.1 slots which are 32-bit and operate at 66MHz. The SIL3114 is universal and can be …

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

EIA-310-D STANDARD RACKS

The EIA 310-D standard rack is 19 inches wide for servers, This has been in use for many decades as data centers galore can then use commodity machines for various purposes. EIA racks units are 1¾ inches. So generally servers are 1U, 2U or 4U however some blade boxes may be as large as 10U. …

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

SSD RELIABILITY

Solid State NAND based flash drives surfaced in 1991 when Sandisk introduced a 20MB product for $1000. Since that early drive, prices have fallen considerably. NAND based SSD products have come in a rage of form factors however the focus of this study will be with SATA drives. Eventually we may add second section for …

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