running isamchk -eis and -o gives me following
output....

1) impossible length!!!  does anyone got this before?

2) recordspace used: 100%  ??? what does this mean?
   I have plenty of space on my hard drive


# isamchk -o trend_data
- recovering ISAM-table 'trend_data.ISM'
Data records: 2371874
Found block with impossible length 4294967229 at
160392545; Skipped
Data records: 2238318

# isamchk -eis trend_data
Checking ISAM file: trend_data
Key:  1:  Keyblocks used:  50%  Packed:   92%  Max
levels:  4
Key:  2:  Keyblocks used:  60%  Packed:   70%  Max
levels:  6
Key:  3:  Keyblocks used:  49%  Packed:   85%  Max
levels:  4
Key:  4:  Keyblocks used:  49%  Packed:   92%  Max
levels:  4
Key:  5:  Keyblocks used:  83%  Packed:    0%  Max
levels:  4
Key:  6:  Keyblocks used:  51%  Packed:   81%  Max
levels:  5
Total:    Keyblocks used:  57%  Packed:   80%

Records:          2238318    M.recordlength:      72  
Packed:            64%
Recordspace used:     100%   Empty space:          0% 
Blocks/Record:   1.00
Record blocks:     2238318    Delete blocks:         0
Record data:     163384748    Deleted data :         0
Lost space:              0    Linkdata:       6714954

User time 1576.95, System time 75.15
Maximum resident set size 0, Integral resident set
size 0
Non physical pagefaults 0, Physical pagefaults 9912,
Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals 0
Vouluntary context switches 10493, Invouluntary
context switches 12475



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