This document describes how to distinguish the 128 MB Hitachi Flash disk from the 128 MB SanDisk Flash disk on a Cisco 7400 Series Router if you are unable to physically access the router to examine the Flash disk.
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There are no specific prerequisites for this document.
The information in this document is based on the hardware below:
Cisco 74xx Series Routers with SanDisk and Hitachi Flash disks
The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
Field Notice: Flash Disk Failure on Cisco 7401ASR describes a problem involving Flash disk failure on the 7401ASR, and advises that failing Hitachi 128MB Flash disks be replaced.
The procedure presented here helps you identify which card is in the box, and if it is indeed the Hitachi card that should be replaced per the Field Notice.
To determine which Flash disk is installed in the router, execute the show disk command from the enable-mode command prompt.
When executing the show disk command, a 128 MB Hitachi card will have 978 cylinders, while the same command executed on a SanDisk 128 MB Flash disk will show 980 cylinders.
The outputs for an Hitachi 128 MB disk and a SanDisk 128 MB disk are shown below:
matrix1#show disk ******** ATA Flash Card Geometry/Format Info ******** ATA CARD GEOMETRY Number of Heads: 8 Number of Cylinders 978 !--- 978 cylinders Sectors per Cylinder 32 Sector Size 512 Total Sectors 250368 ATA CARD FORMAT Number of FAT Sectors 123 Sectors Per Cluster 8 Number of Clusters 31209 Number of Data Sectors 250080 Base Root Sector 374 Base FAT Sector 128 Base Data Sector 406
asr-ce#show disk0: ******** ATA Flash Card Geometry/Format Info ******** ATA CARD GEOMETRY Number of Heads: 8 Number of Cylinders 980 !--- 980 cylinders Sectors per Cylinder 32 Sector Size 512 Total Sectors 250880 ATA CARD FORMAT Number of FAT Sectors 123 Sectors Per Cluster 8 Number of Clusters 31273 Number of Data Sectors 250592 Base Root Sector 374 Base FAT Sector 128 Base Data Sector 406
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Refer to Cisco Technical Tips Conventions for information on conventions used in this document.