I copied all files from /mnt/wd1l to /mnt/wd2l

wd2l is slightly larger than wd1l; yet wd2l is full!

$ df -h /mnt/wd1l /mnt/wd2l
Filesystem Size Used Avail Capacity Mounted on
/dev/wd1l 1020G 952G 16.5G 98% /mnt/wd1l
/dev/wd2l 1020G 969G -508M 100% /mnt/wd2l

Output from disklabel is almost identical:

type: SCSI
disk: SCSI disk
label: WDC WD2000FYYZ-0
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 243201
total sectors: 3907029168
rpm: 0
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # microseconds
track-to-track seek: 3907029168 # microseconds
drivedata: 0

Difference between wd1 and wd2:
wd1: interleave: 0
wd2: interleave: 1

Partition details (A added 'wd1/wd2' to beginning of line:
# size offset fstype [fsize bsize cpg]
wd1l: 2147472640 525486208 4.2BSD 8192 65536 1
wd2l: 2147483647 63 4.2BSD 8192 65536 1

 Why is wd2l full?

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