0662

0662-Sxx    1.05 GB, 3.5x1, ???? RPM

Hot Plug/Unplug Support
   Power supply and SCSI bus hot plug and unplug is allowed. There is no special sequence required for connecting 5 volt, 12 volt, or ground. During a hot plug-in event the drive being plugged with draw a large amount of current at the instant of plug-in. This current spike is due to charging the bypass capacitors on the drive. This current pulse may cause the power supply to go out of regulation.
If this supply is shared by other drives then a low voltage power on reset may be initiated on those drives. Therefore the recommendation for hot plugging is to have one supply for each drive. Never daisy chain the power leads if hot plugging is planned. Hot plugging should be minimized to prevent wear on the power connector. 
   Hot plugging the SCSI bus may cause glitches on the bus. To minimize the chance of glitching, it is recommended to plug in the SCSI bus before the power is applied. 
   During hot plugging, the supplies must not go over the upper voltage limit. This means that proper ESD protection must be used during the plugging event. 

Option jumper blocks
0662 contains a front jumper block with pins that can be used to access and enable certain features and select the SCSI address of the drive. figure 3A shows the layout of those pins for the "SMD" version of the electronics circuit board. For the "SMP" version of the electronics circuit board, those functions are split into two groups of pins. The front block is shown in figure 4A, while the block located on the bottom is shown in figure 6. 68 pin models also contain a rear option jumper block that replicates some of the functions contained in the front block. The layout of those pins are shown in figure 7. 



Drive Not Responding
From Mike King
   I had this problem with my Server 9595-B20 which had six 0662 1GB drives on the RAID controller.  I had maybe three drives "not responding" when I started (the system had been out of use for some months before it came to me), in each case the "not responding" drive had failed to spin up. I find 0662s that are not used for a longish period often are reluctant to start spinning but usually respond to a sharp rotational flick in the plane of the platters (no DC power required) and its easy to try if you have hot swap bays.  In my case it was fairly easy to start all the drives and restore the RAID volume.
   Once started in this way the drives will continue to start properly on power up as long as they don't lie on the shelf too long.  Actually 0662s often get a pretty bad press but I have never had one go bad whilst in regular use.


Figure 1- SMD and SMP layouts

Figure 3A Front options jumper block for SMD versions

 

Figure 2 Electrical connectors (rear view) 50 pin SCSI 

Figure 3 SMD jumper pin locations (front view) 

Figure 4 SMP jumper pin locations (front view)

Figure 4A Front options jumper block for SMP versions

Figure 5A Address determination-50 pin SCSI models 
Bit 0
Bit 1
Bit 2
Address
off
off
off
0
on
off
off
1
off
on
off
2
on
on
off
3
off
off
on
4
on
off
on
5
off
on
on
6
on
on
on
7
Note: In the address determination tables above "off" means jumper is not in place and "on" means jumper is in place.

Figure 6 Bottom options jumper block for SMP versions

Figure 7 Rear options jumper block for 68 pin models 

Figure 8 Address determination-68pin SCSI models 
Bit 0
Bit 1
Bit 2
Bit 3
Address
off
off
off
off
0
on
off
off
off
1
off
on
off
off
2
on
on
off
off
3
off
off
on
off
4
on
off
on
off
5
off
on
on
off
6
on
on
on
off
7
off
off
off
on
8
on
off
off
on
9
off
on
off
on
10
on
on
off
on
11
off
off
on
on
12
on
off
on
on
13
off
on
on
on
14
on
on
on
on
15

Note: In the address determination tables above "off" means jumper is not in place and "on" means jumper is in place. 

Auto start (& delay) pins
The auto start and auto start delay pins control when and how the drive can spin up and come ready. When configured for auto-startup, the motor spins up after power is applied without the need of a SCSI start unit command. For no auto-start, a SCSI start unit command is required to make the drive spin and be ready for media access operations. When in auto-start mode, the drive will delay its start time by a period of time multiplied by its own SCSI address. The table below shows whether or not auto-start mode is active and the delay periods, where applicable, for all combinations of the pins. 
 
Auto start delay
Auto start
Auto start mode?
Delay multiplier (sec)
off
off
No
NA
off
on
Yes
0
on
off
Yes
10
on
on
Yes
4

LED pins 
The LED pins can be used to drive an external light emitting diode. Please refer to the LED pin section of the 0662 interface specification for a detailed functional description of this pin. 
  o Up to 33 mA +/- 5% of TTL level LED drive capability is provided. 

Note: These pins can be used to drive an LED located in a bezel connected to the front of the drive or to an external LED in systems where the front of the drive cannot be easily seen. 

Note: 68 pin SCSI models have two sets of pins, a set on the front and a set on the back, that are connected to the same LED driver circuit. The combined drive capability is stated above. 

Write protect pins
If the write protect pin is jumpered to ground, the drive will inhibit SCSI commands that alter the customer data area portion of the media from being performed. See the 0662 interface specification for functional details. 

Disable T.I. sync. negotiation pins
If a disable target initiated synchronous negotiation pin is grounded then an initiator is required to start a negotiation handshake if synchronous SCSI transfers are desired. Please refer to the 0662 interface specification for more details on this feature. 

Disable SCSI parity pins
Grounding this pin will disable SCSI parity checking. 

Disable unit attention pins 
Grounding this pin will disable the drive from building unit attention sense information for commands immediately following a power on reset (POR) or SCSI bus reset. Any pending unit attention conditions will also be cleared at POR or SCSI reset times. 

Customizing pins 
The customizing pins and their associated jumper pins are currently reserved for future use. They are for features specific to particular host systems that must be in effect immediately after power is applied to the drive. Please contact your technical support representative for functional details on using system specific required features that these pins could possibly be used for. 

Difference between the -S12, S1D and -S1W
  Model       No of SCSI         SCSI           No of
   No         connector       electrical      data heads
                 pins        signal type
  S12            50              SE               5
  S1D            50              DF               5
  SW1            68              SE               5
  SWD            68              DF               5

Note: "SE" stands for single ended, while "DF" stands for differential.

NOTE: The 0662 uses 6x32 mounting screws, maximum allowable penetration of the mounting screws is 3.8 mm

SCSI bus termination power
Termination power is optionally provided for systems that desire to use it. In order to use the termination power, the user needs to install a jumper between pins A01 and A02 of the termpower block. (Refer to figure 6 and figure 7). The jumper should only be installed on one device, which should be the last device on the SCSI bus (ie, the drive that is physically closest to a terminator). 68
pin models can source up to 2.0 amps of current at 5.0 volts (plus or minus 5%) for termination power. 50 pin models can source up to 1.5 amps of current at 5.0 volts (plus or minus 5%) for termination power. 

SCSI bus termination power short circuit protection 
The ANSI SCSI-2 specification recommends for devices that optionally supply TERMPWR, to include current limited protection for accidental short circuits. It also recommends that the maximum current available for TERMPWR should not exceed 5 amps, UL has a different requirement that they call the 8 amp rule. This rule states that when a power source leaves an enclosure (like SCSI
TERMPWR in the SCSI cable), it must trip 8 amps of current within 1 minute. 

0662 uses a resettable "Positive temperature coefficient" (PTC) resistor for TERMPWR short circuit protection. These devices will trip when they are over-heated due to excess current flowing through them. When the over current condition (ie, current surge due to a hot plug or intermittent short, or a solid short circuit) is removed, the device can automatically reset, allowing  TERMPWR to again  be sourced from this device. 

0662 complies with the 8 amp UL requirement. For systems that prefer to with the SCSI-2 5 amp recommended TERMPWR limit, the 5 volt power supplied 0662 should be limited to prevent TERMPWR from exceeding 5 amps. This would prevent a current surge in excess of 5 amps that may occur in the event of a short circuit, before the PTC device can actually trip.

Attachment to specific systems / SCSI controllers 
The following SCSI Adapters have been evaluated with the 0662 drives on typical MCA platforms with a range of operating systems. Any limitations are noted below. 
     ADAPTEC 1640
     FUTURE DOMAIN MCS-600
     FUTURE DOMAIN MCS-700-Partition limit 1 GB
     IBM Spock Prime
     BUSLOGIC BT 6465

Fast SCSI 
The ANSI SCSI committee recommend that fast SCSI devices (such as 0662) must have cable lengths of less than 3 metres and must use active terminators. 
NOTE: 0662 has onboard active terminators which are jumper selectable. 
 
 

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