
During drive start up and seeking, 12 volt ripple is generated by the drive (referred to as dynamic loading). If
several files have their power daisy chained together then the power supply ripple plus other drive's dynamic
loading must remain within the regulation tolerance of ± 0.5%. A common supply with separate power
leads to each drive is a more desirable method of power distribution.
To prevent external electrical noise from interfering with the drive's performance, the drive must be held by
four screws in a user system frame which has no electrical level difference at the four screws position, and has
less than ± 300 milivolts peak to peak level difference to the drive power connector ground.
6.6.1 Start Up Current
Figure 37. Power Supply Generated Ripple at Drive Power Connector
Maximum
Notes
+ 5 V D C
100 [ mV pp]
0-10 [ MHz]
+ 1 2 V D C
150 [ mV pp]
0-10 [ MHz]
Figure 38. Typical Current Wave F o r m of 12V at Start Up of DDRS-34560
42
O E M Spec. of DDRS-3xxxx
Summary of Contents for DDRS-39130 - Ultrastar 9.1 GB Hard Drive
Page 2: ......
Page 14: ...4 OEM Spec of DDRS 3xxxx...
Page 15: ...Part 1 Functional Specification Copyright IBM Corp 1997 5...
Page 16: ...6 OEM Spec of DDRS 3xxxx...
Page 18: ...8 OEM Spec of DDRS 3xxxx...
Page 26: ...16 OEM Spec of DDRS 3xxxx...
Page 28: ...18 OEM Spec of DDRS 3xxxx...
Page 30: ...20 OEM Spec of DDRS 3xxxx...
Page 56: ...6 8 1 2 68 pin Model Figure 40 Outline of 68 pin Model 46 OEM Spec of DDRS 3xxxx...
Page 57: ...6 8 1 3 80 pin Model Figure 41 Outline of 80 pin Model Specification 47...
Page 60: ...6 8 3 2 68 pin Model Figure 45 Interface Connector 68 pin Model 50 OEM Spec of DDRS 3xxxx...
Page 61: ...6 8 3 3 80 pin Model Figure 46 Interface Connector 80 pin Model Specification 51...
Page 70: ...60 OEM Spec of DDRS 3xxxx...
Page 71: ...Part 2 SCSI Interface Specification Copyright IBM Corp 1997 61...
Page 72: ...62 OEM Spec of DDRS 3xxxx...
Page 172: ...162 OEM Spec of DDRS 3xxxx...
Page 188: ...178 OEM Spec of DDRS 3xxxx...
Page 208: ...198 OEM Spec of DDRS 3xxxx...
Page 214: ...204 OEM Spec of DDRS 3xxxx...
Page 224: ...214 OEM Spec of DDRS 3xxxx...
Page 228: ...Part Number 00K0097 Published in Japan S00K 0097 03...