Question 1

What is IBM 9840 Data Tape?

Accepted Answer

IBM 9840 Data Tape is a high-performance, open-reel magnetic tape format designed for midrange and mainframe data backup, archiving, and disaster recovery.

Question 2

What is IBM 9940 Data Tape?

Accepted Answer

IBM 9940 Data Tape is an extended-length, open-reel magnetic tape format that delivers up to 50% more native capacity than 9840 for large-scale backup and archive applications.

Question 3

How do 9840 and 9940 Data Tapes differ?

Accepted Answer

The 9940 format offers higher native capacity (up to 50% more), improved data transfer rates, and longer reel length compared to 9840 while maintaining the same drive form factor.

Question 4

What are the native and compressed capacities of 9840 and 9940 tapes?

Accepted Answer

IBM 9840 tapes deliver up to 40 GB native (100 GB compressed), while 9940 tapes offer up to 60 GB native (150 GB compressed) using 2.5:1 compression.

Question 5

What data transfer rates do 9840 and 9940 tapes support?

Accepted Answer

IBM 9840 drives support up to 12 MB/s native (30 MB/s compressed), and 9940 drives support up to 15 MB/s native (37 MB/s compressed).

Question 6

Which tape drives are compatible with 9840 and 9940 cartridges?

Accepted Answer

9840 cartridges work with IBM 9840-E and 9840-F drives; 9940 cartridges require IBM 9940-A or 9940-B drives, all with backward read/write support for earlier media.

Question 7

Are 9840 and 9940 tapes suitable for long-term archiving?

Accepted Answer

Yes; both formats use durable magnetic media and robust cartridge shells for archival retention of up to 30 years under proper environmental conditions.

Question 8

Do 9840 and 9940 tapes support hardware encryption?

Accepted Answer

Yes; IBM 9840 and 9940 tape drives offer optional built-in AES-256 hardware encryption to ensure data confidentiality at rest.

Question 9

Can I implement WORM functionality on 9840 and 9940 tapes?

Accepted Answer

Yes; write-once, read-many (WORM) cartridges are available for both formats to meet regulatory and compliance requirements.

Question 10

What is the recommended storage environment for 9840 and 9940 tapes?

Accepted Answer

Store tapes vertically in a controlled environment at 16–25 °C and 20–50% RH, away from magnetic fields and direct sunlight to preserve media integrity.

Question 11

How many mounting cycles do 9840 and 9940 tapes support?

Accepted Answer

IBM specifies up to 1,000 non-reversible mounting cycles per cartridge under normal operating conditions for both 9840 and 9940 tapes.

Question 12

How do I clean 9840 and 9940 tape drives?

Accepted Answer

Use IBM-approved cleaning cartridges after every 50 mounts or when the drive reports a cleaning request; follow the drive’s user guide for safe procedures.

Question 13

What are the key use cases for 9840 and 9940 Data Tape?

Accepted Answer

Ideal for large-scale backups, hierarchical storage management, regulatory archive, and disaster recovery in banking, healthcare, government, and enterprise IT.

Question 14

How cost-effective are 9840 and 9940 tapes compared to disk storage?

Accepted Answer

Magnetic tape delivers up to 80% lower $/GB acquisition and long-term retention costs than disk, with reduced power and cooling expenses for archives.

Question 15

Can 9840 and 9940 tapes be reused?

Accepted Answer

Yes; tapes can be overwritten or reformatted up to the specified mounting cycle limit unless configured as WORM media.

Question 16

How do I choose between 9840 and 9940 for my environment?

Accepted Answer

Select 9840 for standard midrange backup, and choose 9940 when you require higher capacity and throughput without changing your tape infrastructure.

Data Tape Series 9840 & 9940

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Questions & Answers

What is IBM 9840 Data Tape?

What is IBM 9940 Data Tape?

How do 9840 and 9940 Data Tapes differ?

What are the native and compressed capacities of 9840 and 9940 tapes?